Haima M3. Chassis System. Service Manual - part 4

 

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Haima M3. Chassis System. Service Manual - part 4

 

 

 

Steering system 2F-15 

 

 

Check of steering tie rod end 

1.  Check the tie rod end for damages or rubber 

sleeve for cracks. 

2.  Replace if necessary. 

3.  Check the ball joint for loosening. 

4.  Replace the tie rod end if necessary. 

5.  Turn the ball head five times. 

6.  Measure the rotation torque of ball head with a 

special tool and spring. 

• 

If not within the specified range, replace the tie 
rod end. Rotation torque: 

0. 4-2.7N.m{3.5-26.0kgf.cm, 3.1-22.5in.lbf} 

Reading of spring balance: 

3. 4-25.5N{0.35-2.60kgf, 0.8-5.71bf} 

 

 

Check of steering tie rod 

1.  Check the tie rod for bends or damages, and 

replace it if necessary. 

2.  Check the ball joint for loosening, and replace 

it if necessary. 

3.  Swing the tie rod back and forth five times. 

4.  Measure the swing torque with a spring 

balance. 

If the torque is not within the specified range, 
replace the tie rod.  

Swing torque: 

0. 1-4. 0N·m(1-39kgf.cm, 0. 9-30. 8in.lbf} 

Reading of spring balance: 

0. 6-24. 5N.m{0. 06-2. 50kgf, 0. 13-5. 501bf} 

 

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Steering system 2F-16 

 

Assembling of steering gear and connecting rod 

1.  Assemble them in the sequence shown in the table. 

 

Tie rod end rubber sleeve: refer to its 
installation instructions. 

 20

Snap 

ring 

Supporting rubber block: refer to its installation 
instructions. 

 

21

Socket sleeve bolt 

3 Gearbox 

  22

Dust 

cover 

Supporting block 

 

23

“O” ring 

Supporting block bracket 

 

24

Limit washer 

Oil seal: refer to its installation instructions. 

 

25

Hold down spring 

Bush: refer to its installation instructions. 

 

26

Adjusting cover: refer to its installation 
instructions. 

“O” ring 

 

27

Lock nut(adjusting cover) 

9 Seal 

ring 

  28

Washer 

10 

Steering rack 

 

29

Tie rod 

11 

“O” ring 

 

30

Dust jacket 

12 

U seal gasket 

 

31

Dust jacket wire 

13 

Hoop: refer to its installation instructions. 

 

32

Spring clip 

14 

Valve chamber 

 

33

Lock nut(tie rod end) 

15 

Oil seal: refer to its installation instructions. 

 

34

Tie rod end 

16 

Upper bearing: refer to its installation 
instructions. 

 

35

Oil pipe 1 

17 

Gear shaft 

 

36

Oil pipe 2 

18 

Seal ring: refer to its installation instructions. 

 

37

Heat shield 

19 Control 

valve 

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Steering system 2F-17 

 

 

 

 

Keypoints for installing the tie rod end rubber 
sleeve 

1.  Wipe off the oil dirt from the ball joint. 

2.  Put a little of grease into new dust jacket. 

3.  Install the dust jacket on the end of tie rod with 

a special tool and press. 

4.  Wipe off all the exposed grease. 

 

 

Keypoints for installing the supporting rubber 
block 

1.  Apply the soap water to the rubber of 

supporting block. 

2.  Press the rubber support block with a special 

tool and press, until the rubber end comes out 
of gear chamber. 

 

 

3.  Turn back the gear chamber, and press the 

rubber supporting block, until the rubber block 
comes out of its other side. 

4.  Align the rubber supporting block to steel pipe.

 

Attentions for installing the oil seal and bush 

1.  Install a new “O” ring and seal ring on the rack 

lever. 

2.  After installing the seal ring, make it tightly 

affix the lever. 

3.  Attach a new oil seal to (49B032 325) with a 

special tool (49 B032 324). 

Oil seal 

Rubber mat

Steel pipe

The rubber block end is 
aligned to steel pipe.

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Steering system 2F-18 

 

 

4.  Remove the special tool (49B032325). 

5.  Place the oil seal on the edge of rack lever with 

a special tool, and remove the special tool. 

6.  Attach a new bush to steering rack.  

Note

  While pressing it in, the applied force shall not 

exceed 39kpa{400kg}cm2, 5688psi} to avoid 
the damages of oil seal and bush. 

  Apply a little of grease to the seal ring and oil 

seal bush. 

 

 

 

7.  Install the steering rack into gearbox, and press 

in the oil seal and bush with a special tool, until 
it’s difficult to press. 

 

 

Keypoints for installing the hoop 

1.  Apply a little of lubricating oil to “O” ring and 

U seal gasket. 

2.  Install “O” ring and U seal gasket on the socket 

sleeve. 

3.  Install them on the steering gear with a special 

tool. 

 

 

4.  Install the hoop with a special tool. 

 

5.  Fix the hoop on cylinder body with a chisel. 

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Steering system 2F-19 

 

 

 

Keypoints for installing the oil seal 

1.  Apply the appropriate amount of grease to new 

oil seal. 

2.  Press in the new oil seal with a special tool. 

 

 

Keypoints for installing upper bearing 

1.  Apply the appropriate amount of grease to new 

upper bearing. 

2.  Press in the bearing with a special tool. 

 

 

1.  Attach a new seal ring to the valve body of 

gear shaft with a special tool. 

2.  After the installation, place the seal ring in 

position with a special tool. 

3.  Install the snap ring. 

 

 

Keypoints for installing the adjusting cover 

1.  Place the rack in middle position. 

2.  Tighten the adjusting cover up to its tightening 

torque of 19.6N.m{2.0kgf.m} three times, and 
then turn the end cover by 23° with a special 
tool.  

 

[Reading of spring balance]9.9-13.7N{1.0-1.4kgf} 

Install the lock nut with a special tool.  

Tightening torque: 40-49N·m{4. 0-5.0kgf.m} 

 

 

Check of air tightness 

1.  Connect the special tool to the gear chamber 

booster cylinder. 

2.  Apply a vacuum pressure of 53.3kpa 

{400mmHg,15.7inHg) to cylinder with a 
vacuum pump, and ensure that its vacuum 
pressure can be kept for at least 30s. 

  If this vacuum pressure can’t be kept, replace 

the oil seal. 

 

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Steering system 2F-20 

 

Removal and installation of power steering pump 

1.  Remove it in the sequence shown in the table. 

2.  Install it in the reverse sequence of removal. 

3.  Adjust the drive belt (refer to the drive belt, 

adjustment of drive belt). 

 

 

1 Adjusting 

bolt 

2 Tightening 

bolt 

3 Drive 

belt 

Pressure switch plug 

5 High-pressure 

pipe 

6 Oil 

suction 

hose 

Oil pump and support 

 

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Steering system 2F-21 

 

Disassembly and assembly of power steering pump 

Note

  The following operation can be performed only after replacing “O”ring and oil seal. If it’s still 

required to check other items, replace the pump body assembly. 

1.  Disassemble it in the sequence shown in the table. 

2.  Assemble it in the reverse sequence of disassembly. 

 

 

Power steering pump assembly: refer to 
its disassembly instructions. 

 

Cam ring: refer to its installation 
instructions. 

2 Bolt 

 

10 Snap 

ring 

Oil suction pipe  

 

11 

Rotor 

4 O 

ring 

 

12 

Impeller: refer to its assembling 
instructions. 

Pressure switch 

 

13 

Front pump body 

Rear pump body: refer to its assembling 
instructions. 

 

14 Shaft 

assembly 

7 O 

ring 

 

15 

Oil seal: refer to its assembling 
instructions. 

8 Side 

disc 

 

   

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Steering system 2F-22 

 

 

 

 

Keypoints for disassembling the power steering 
pump assembly 

Note

  While clamping the assembly with a vice, fix, 

remove and assemble it with a special tool to 
avoid the damages of oil pump.  

 

 

Keypoints for installing the oil seal 

Note

  Locate the pump body. Install the oil seal with 

a special tool and hammer. 

 

 

Keypoints for installing the blade 

Place the blade inside the rotor, the round edge of 
blade shall contact with that of inner cam ring. 

 

 

Keypoints for installing inner cam ring 

With the mark up, install the inner cam ring into 
front pump body. 

 

Keypoints for installing rear pump body 

After installing rear pump body, turn the wheel shaft 
by hands, and observe whether it rotates smoothly. 

 

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Brake system 2F-1 

 

Chapter 15 

Brake system 

 

General and operation ............................................................................................................................ 2F-2 

Operation of brake caution light........................................................................................................ 2F-2 

Description of ABS fault light .......................................................................................................... 2F-2 

Description of ESP fault light ........................................................................................................... 2F-2 

Description of ESP-OFF switch indicator lamp................................................................................ 2F-2 

Parts of brake system.............................................................................................................................. 2F-3 

Diagnostic data and procedures......................................................................................................... 2F-5 

Faults of brake system....................................................................................................................... 2F-6 

Manual exhaustion ............................................................................................................................ 2F-6 

Check of pedal stroke........................................................................................................................ 2F-7 

Check of brake pedal free stroke....................................................................................................... 2F-7 

Repair instructions ............................................................................................................................ 2F-8 

Specifications .................................................................................................................................. 2F-10 

Circuit diagram.................................................................................................................................2F-11 

Repair of parts....................................................................................................................................... 2F-12 

Brake master cylinder with oil cup.................................................................................................. 2F-12 

Diagnostic references and procedures............................................................................................. 2F-12 

Brake master cylinder with brake fluid reservoir assembly ............................................................ 2F-12 

Specifications .................................................................................................................................. 2F-13 

Vacuum booster .............................................................................................................................. 2F-13 

Check of vacuum ................................................................................................................................... 2F-13 

Repair instructions .......................................................................................................................... 2F-14 

Front and rear brakes....................................................................................................................... 2F-15 

Check of front-disc brake................................................................................................................ 2F-16 

Removal and installation of Front-disc brake ................................................................................. 2F-18 

Check of rear-drum brake ............................................................................................................... 2F-20 

Removal and installation of rear-drum brake.................................................................................. 2F-21 

Check of rear-disc brake ................................................................................................................. 2F-23 

Removal and installation of rear-disc brake.................................................................................... 2F-24 

Parking brake system............................................................................................................................ 2F-25 

General and operation ..................................................................................................................... 2F-25 

Structure diagram ............................................................................................................................ 2F-25 

Repair instructions .......................................................................................................................... 2F-25 

Parameters ............................................................................................................................................. 2F-27 

General technical parameters .......................................................................................................... 2F-27 

Locking torque parameters.............................................................................................................. 2F-27 

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Brake system 2F-2 

 

ABS system ............................................................................................................................................ 2F-27 

Overview ................................................................................................................................................ 2F-27 

I. Attentions..................................................................................................................................... 2F-27 

II. Initial check ................................................................................................................................ 2F-29 

Introduction of ABS 9 system .............................................................................................................. 2F-31 

I. Composition of ABS 9 system..................................................................................................... 2F-31 

II. Hydraulic diagram for Haima M3 ABS 9 X-type arrangement.................................................. 2F-31 

III. Haima M3 ABS 9 ECU interface circuit................................................................................... 2F-33 

Fault diagnosis ....................................................................................................................................... 2F-35 

I. Diagnostic flow............................................................................................................................ 2F-35 

II. For the faults without fault codes, repair it................................................................................. 2F-36 

III. Repair of occasional faults ........................................................................................................ 2F-37 

IV. Analysis of fault codes.............................................................................................................. 2F-38 

Removal and installation ...................................................................................................................... 2F-44 

I. Steps for removing ABS assembly .............................................................................................. 2F-44 

II. Installation steps of ABS assembly ............................................................................................ 2F-44 

III. Cross validation......................................................................................................................... 2F-44 

IV. Exhaust instructions .................................................................................................................. 2F-44 

Summary................................................................................................................................................ 2F-47 

I. Attentions..................................................................................................................................... 2F-47 

II. Initial check ................................................................................................................................ 2F-49 

Introduction of ESP 9 system ............................................................................................................... 2F-51 

I. Composition of ESP 9 system...................................................................................................... 2F-51 

II. Hydraulic diagram for ESP 9...................................................................................................... 2F-52 

III.Haima M3 ESP 9 ECU interface circuit..................................................................................... 2F-53 

Fault diagnosis ....................................................................................................................................... 2F-55 

I. Diagnostic flow............................................................................................................................ 2F-55 

II. For the faults without fault codes, repair it................................................................................. 2F-56 

III. Repair of occasional faults ........................................................................................................ 2F-56 

IV. Analysis of fault codes.............................................................................................................. 2F-57 

Removal and installation ...................................................................................................................... 2F-62 

I. Steps for removing ESP assembly ............................................................................................... 2F-62 

II. Installation steps of ESP assembly ............................................................................................. 2F-62 

III. Exhaust instructions .................................................................................................................. 2F-62 

IV. Instructions for calibrating the integrated inertial sensor (ESP9i system) ................................ 2F-64 

 

 
 

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Brake system 2F-2 

 

General and operation 

Operation of brake caution light  

The brake caution light (BRAKE)

 applied  in 

this brake system is located inside the instrument 
panel. When the ignition switch is in ON gear, the 
brake caution light will go on. When the ignition 
switch returns to ACC gear, the caution light will 
go out. The following cases will make the caution 
light go on. 

   In case of applying the parking brake when 

the ignition switch is in ON gear, the caution 
light will go on. 

  When the level of brake fluid is below a 

certain value, “BRAKE” 

 caution light will 

go on. 

 

Description of ABS fault light 

ABS fault light 

 applied in this brake system is 

located inside the instrument panel (as shown in 
the figure). 

Self-check of ABS: when the ignition switch is 
turned from ACC to ON, the self-check of ABS is 
started, and the fault light goes on. After finishing 
its self-check within 0.7 to 3s, the fault light goes 
out, it certifies the normality of ABS system; if it’s 
constantly on, ABS system will be faulty, and the 
professionals are required to check the faults of 
ABS system (for its details, see the description of 
ABS anti-lock system repair). 

 

Description of ESP fault light 

ESP fault light

 applied in this brake system 

is located inside the instrument panel (as shown in 
the figure). 

ESP self-check: when the ignition switch is turned 
from ACC to ON, the self-check of ESP is started, 
and the fault light goes on at this time. After 
finishing its self-check, the fault light goes out, and 
it certifies the normality of ESP system; if it’s 
constantly on, ESP system will be faulty, and the 
professionals are required to check the faults of 
ESP system (for its details, see the description of 
ESP anti-lock system repair). 

 

 

Description of ESP-OFF switch indicator 
lamp 

ESP manual switch indicator lamp 

applied in 

this brake system is located inside the instrument 
panel (as shown in the figure). 

When ESP-OFF light

goes on, it indicates the 

functions of ESP is manually closed, its functions 
can be started with ESP switch button, and ESP-

OFF light

will go out after starting it.

 

 

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Brake system 2F-3 

 

Parts of brake system 

Brake system (I) 

 

 

1. Front steering knuckle 
with brake assembly(right) 

2. Front brake hose assembly

3. Front wheel speed 
sensor(right) 

4. Elastic card 

5. Pipe clamp B 

6. Lock bolt 

7. Vacuum power-assisting 
hose assembly 

8. Front wheel speed 
sensor(left) 

9. Front wheel speed sensor 
support (left) 

10. lock bolt 

11. Hollow bolt 

12. Washer 

13. Rear brake pipe front 
section(right)

 

14. Front brake pipe(left) 

15. Brake master cylinder 
rear chamber oil pipe 
assembly 

16. brake master cylinder 
front chamber oil pipe 
assembly 

17. Combination nut 

18. Lock bolt 

19. ABS support 

20. ABS support cushion 

21. ASB controller 

22. Rear brake pipe front 
section (left) 

23. Front brake pipe(right) 

24. Front steering knuckle 
with brake assembly(right) 

25. With master cylinder 
vacuum booster assembly

 

26. Pin shaft 

27. Split pin 

28. Brake pedal assembly 

29. Flange nut 

30. Lock bolt 

31. Vacuum power-assisting 
hose assembly 

32. Parking brake handle 
assembly 

33. Lock bolt 

34. Parking cable assembly 
(right) 

35. Lock bolt 

36 .parking cable assembly 
(left) 

37. Pipe clamp E 

38. Pipe clamp F 

39. Pipe clamp A 

 

40. Rear-drum brake 
assembly(left or right) 

41. Hexagon flange bolt 

42. Rear wheel speed sensor

43. Rear brake pipe rear 
section (left or right) 

44. Rear brake hose 
assembly

 

 

Brake system(with ABS) 

-------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Brake system 2F-4 

 

 

Brake system (II) 

 

 

 

1. Front steering knuckle 
with brake assembly(right) 

2. Front brake hose 
assembly 

3. Front wheel speed 
sensor(right) 

4. elastic card 

5. pipe clamp B 

6. lock bolt 

7. vacuum power-assisting 
hose assembly 

8. Front wheel speed 
sensor(left) 

9. front wheel speed sensor 
support (left) 

10. lock bolt 

11. hollow bolt 

12. washer 

 

13. Front brake pipe(right)

14. brake master cylinder 
rear chamber oil pipe 
assembly 

15. Brake master cylinder 
front chamber oil pipe 
assembly 

16. ESP controller 

17. Lock bolt 

18. ESP upper support, 
ESP lower support 

19. combination nut 

20. Rear brake pipe front 
section (left) 

21. Rear brake pipe front 
section(right) 

22. front brake pipe(left) 

23. steering angle sensor

 

24. Front steering knuckle 
with brake assembly(right) 

25. With master cylinder 
vacuum booster assembly 

26. Pin shaft 

27. split pin 

28. brake pedal assembly 

29. flange nut 

30. lock bolt 

31. Vacuum power-assisting 
hose assembly 

32. parking brake handle 
assembly 

33. lock bolt 

34 .parking cable 
assembly(right)  

35. Lock bolt 

 

36. Parking cable assembly 
(left) 

37. Pipe clamp E 

38. Pipe clamp F 

39. Pipe clamp A 

40. Rear-disc brake 
assembly(left or right) 

41. Rear brake hose assembly 

42. Rear wheel speed sensor 

43. Hexagon flange bolt

 

 

Brake system(with ESP) 

-------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Brake system 2F-5 

 

Diagnostic data and procedures 

Brake system test 

The brake test must be performed on dry, clean and 
flat road without slope. If the road surface is wet 
and slippy, oil dirty or soft, the vehicle can’t stick 
to the ground evenly, thus its real braking 
performance can’t be tested. 

The brake test shall be performed with lighter and 
heavier pedal-applying forces at different speeds, 
but the lock of brake and slippage of vehicle must 
be avoided. Even if the vehicle is braked with a 
large force, its lock and slippage can show its 
braking ability. During the rotation of wheel, its 
braking distance is less than the one while it’s 
locked, the friction force between the wheel and 
ground is also below the force of wheel while it’s 
slipped. The higher its deceleration speed is, the 
higher the required brake pedal force is. Three key 
external factors can influence its braking ability: 

  The uneven adhesion between the tire and 

ground will lead to uneven braking force, the 
air pressures of left and right tires shall be 
equal to each other, and the patterns of left 
and right tires shall be the same. 

  Uneven load will also influence its braking 

ability, because the wheel with higher load 
requires a higher braking input force than any 
other wheel, so it can also produce a higher 
braking force. 

  Projected or unflat road surface will cause the 

runout of brake. 

Check of brake fluid leakage: make the engine 
idling, put the gear in neutral gear, and step down 
the brake pedal with a consistent force. If the pedal 
sinks, the hydraulic system may be leaked, so the 
system shall be checked. 

Check of fluid level in master cylinder fluid 
reservoir: the slow drop of fluid in fluid reservoir 
is caused by normal wears of friction liner. 
However, its fluid level shows very low, it 
indicates the leakage of system. The system may 
be internally or externally leaked. Sometimes, if no 
faults of system are found out during the following 
check, it may be slightly leaked. If its fluid level is 
normal, check the length of vacuum booster 
pushrod. In case of finding out the improper length 
of pushrod, adjust or replace the pushrod. 

Check the master cylinder through the 
following procedures: 

  Check the casting cracks of master cylinder or 

leakage of brake fluid around it. If at least one 
drop of brake fluid exists outside the master 

cylinder, it indicates the leakage of master 
cylinder, but its problems can’t be explained 
only as per the wetting conditions of master 
cylinder.  

  Check the lengths of linkage and pushrod 

connected to the pedal. If these two parts 
don’t conform to the requirements, 
disassemble the master cylinder, and check 
whether the leather cup is extended or 
expanded. If it’s expanded, the brake fluid 
may be unqualified or polluted. In case of 
confirming the pollution of brake fluid, all the 
parts shall be removed for cleaning, and all 
the brake pipes must be also cleaned.  

Unqualified brake fluid, other mineral oil or water 
in brake fluid will cause the gasification of brake 
fluid or deterioration of rubber parts,e.g. the 
expansion of master cylinder piston rubber cup 
indicates the deterioration of rubber part. 
Meanwhile, the same case also occurs to the brake 
slave cylinder rubber cup. 

In case of finding out the deterioration of rubber 
parts, disassemble all the hydraulic parts, and clean 
themwith alcohol; blow the alcohol dry with 
compressed air before reassembling them, and 
replace all the rubber parts from the system, 
including the hose. 

Check of brake hose 

The hydraulic brake hose shall be checked at least 
once every two years. After the occurrence of 
accidental damages, broken surface scratches, 
leakage or bubbles, the hose must be also checked. 
Check the trends and fixing conditions of hose. If 
the friction of brake hose with other parts occurs, it 
will lead to final failure of surface damages, and its 
check may require a mirror or light. If the above 
cases are found, the hose must be adjusted or 
replaced. 

Operation of caution light 

A warning indicator lamp “BRAKE 

 exists 

on the panel of brake system. When the ignition 
switch is in Position III, the warning lamp will go 
on. When the switch is in position II, the warning 
lamp will go out. 

If the following cases occur, the warning lamp will 
give an alarm: 

  Application of parking brake: in case of 

applying the parking brake, the ignition 
switch is in position II at this time, the 
warning lamp will go on. When the level of 
brake fluid is overlow: when the level of fluid 
in fluid reservoir is overlow, the warning 
lamp will go on. 

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Brake system 2F-6 

 

Faults of brake system 

Fault symptom

 

Cause

 

Remedy

 

Leakage of brake fluid

 

Repair or add in the brake fluid.

 

Short circuit of parking brake 
switch

 

Repair its short circuit part.

 

The brake warning lamp is 

constantly on.

 

Fault of fluid level sensor

 

Replace the sensor.

 

Fault of brake lamp switch

 

Replace the brake lamp switch.

 

Too short length of pushrod

 

Adjust the length of vacuum 
booster pushrod.

 

The brake lamp goes on.

 

Short circuit of brake lamp switch

 

Repair its short-circuit part.

 

Lack or leakage of brake fluid

 

Repair or add in brake fluid.

 

Pollution of brake fluid

 

Replace the brake fluid.

 

Air in brake system

 

Drain the fluid out of brake 
system again.

 

Damages of brake pipe

 

Replace the brake pipe.

 

Insufficient braking force

 

Damages of vacuum power-
assisting hose or non-return valve

 

Replace the vacuum power-
assisting hose or non-return valve.

Seizure of brake pedal

 

Replace the brake pedal.

 

Fault of caliper piston return

 

Replace the return rubber ring.

  

Fault of brake master cylinder

 

Replace the brake master 
cylinder.

 

Braking drag

 

Air in brake system

 

Exhaust the air.

 

Insufficiency or leakage of brake 
fluid

 

Replace the leaked part or add in 
the brake fluid.

 

 

Overlong stroke of pedal

 

Overlong free stroke of brake pedal

Adjust the length of vacuum 
booster pushrod.

 

 

Manual exhaustion 

Important hints: the sequence of exhaustion: left 
rear, left front, right front, right rear. During the 
drainage of fluid, check the level of fluid 
continually, and add in the brake fluid. 

1.  Lift up the vehicle. 

2.  Loosen the bleed bolt and dust cover. 

 

3.  Connect a transparent pipe to bleed screw, 

and make its other end soaked in the brake 
fluid of transparent container. 

 

4.  After stepping the brake pedal slowly several 

times, keep it stepped.  

5.  Loosen the bleed screw, drain the brake fluid, 

and then tighten the screw. 

Note:  Step the pedal until the bleed screw is 

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Brake system 2F-7 

 

tightened. 

6.  Repeat Steps 4 and 5 until all the air is bled. 

7.  Check whether the bleed screw is tightened. 

Check of pedal stroke 

1.  Start the engine. 

2.  Step down the pedal three times. 

3.  Step down the brake pedal with about 30Kg 

(66.15Ib) force, and measure the distance 
between the pedal and the lowest part of front 
barrier. 

Unit: mm

 

Parameter 60 

 

4.  If the distance is below 60mm(2.36in.), it may 

be caused by the worn size of rear brake shoe 
over its specified value or existence of air in 
the pipe. After replacing the brake shoe and 
bleeding all the air, if the distance is still 
below 60mm (2.36in.), it may be caused by 
the faults of rear brake shoe regulator or 

overlong stroke of vacuum booster pushrod, 
but this case seldom occurs. 

5.  After removing the brake drum, check the 

automatic clearance regulator. If it’s damaged, 
repair or replace it. 

Check of brake pedal free stroke 

1.  Step the brake pedal several times to 

eliminate the vacuum of vacuum booster. 

2.  Push the brake pedal by hands, and measure 

the stroke of pedal from its free state to 
hardening position. 

Unit: mm 

Specified value 

5-10 

3.  The free stroke of brake pedal can’t be 

adjusted. 

 

 

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