Great Wall service chassis and body Manual - part 58

BR-28

7.

Tear down the parking brake arm;

Tear down the split pin with pliers to take apart the parking

brake arm.

8.

Take apart the brake pipeline from the wheel pump;

Tear down the brake pipeline and block the oil pipe with a clean

cork.

9.

Tear down the wheel brake pump;

Tear down the two bolts and the wheel-brake cylinder.

10. Tear down the following bolts and wheel-brake

cylinder parts:

(a)

Two piston rod;

(b)

Two dust cover

(c)

Two pistons

(d)

Two piston rubber bows

(e)

Spring.

Braking System

 Rear Brake (Dr)

BR-29

Check and Repair the Rear Brake Parts

1.

Check and test the disassembled parts;

Check the disassembled parts to see whether there is abrasion,

rust or damage.

2.

Measure the inner diameter of brake drum;

Standard inner diameter)

254.0mm

Mix inner diameter: 256.0mm

3.

Measure the thickness of brake shoe liner;

Standard thickness

5.0mm

Min thickness

1.0mm

In case the thickness of brake shoe liner is less than the min

thickness or there is uneven abrasion, change the liner.

Remark: if one of the brake shoes is needed to change, all of the

brake shoes are required to change so that the even braking

performance is maintained.

4.

Measure the brake liner and the brake drum to see

whether they contact closely;

If there is poor contact between the brake liner and the brake

drum, repair the brake shoe with the grinding devices, or

change the brake shoe cluster.

Braking System

 Rear Brake (Dr)

BR-30

Assembly of Rear Brake

remark: assemble the parts according to the

direction in the drawing;

left wheel

right wheel

forward

1.

Assemble the wheel-brake cylinder:

(a)

Coat moderate lithium soap base glycol grease on the

piston cup;

(b)

Assemble the wheel-brake cylinder:

Mount the two piston cups on two piston;

Encase the spring and two pistons in the wheel cylinder

body and

Mount the two dust covers

Remark: Assembly shall be conducted correctly according to

the direction shown in the drawing.

2. Mount the wheel-brake cylinder:

(a)

Use two bolts to fix the wheel-brake cylinder on the rear

bottom plate.

Coat moderate sealing glue (Glue 704) on the position where

the wheel-brake cylinder connects with the bottom plate.

Fastening torque

(16
20)N
m

(c) Connect the brake pipeline on the wheel-brake cylinder.

Fastening torque

18N
m

3.

Coat the following parts with moderate lubricant that

resistant high temperature (do not pollute the friction

plates);

(a)

The upper plain of the hex convex platform where the

bottom plate connects the brake shoe;

(b)

Contact face of the brake shoe and the top lever of wheel

cylinder;

(c)

Contact face of the brake shoe with the support pin.

Braking System

 Rear Brake (DR)

Assembly of Rear Brake

forward

BR-31

(d)

Adjusting bolts

(e)

Contact position where the clearance adjuster and the

brake shoe.

4.

Mount the parking brake drag arm;

Mount the new split pin with pliers to mount the parking brake

drag arm.

5.

Mount the rear brake shoe:

(a)

Mount the parking brake bracing wire on the parking

brake drag arm.

(b)

Mount the rear brake shoe in such way that its end is

inserted into the cylinder rod. Encase the pressure spring

drag rod in the brake bottom plate and the brake shoe

assembly in turn and then insert it in the pressure seat ,

pressure spring, pressure spring seat, finally rotate the

pressure spring in place with the pressure spring fork.

6.

Mount the parking brake pull plate and the front brake shoe:

(a)

Mount the pull plate and the spring.

(b)

Mount the front brake shoe, of which, the end is inserted

in the piston rod, and mount the pull plate. Insert the

pressure spring drag rod in the brake bottom plate and

brake shoe assembly in turn, then encase it in the pressure

spring seat, pressure spring and pressure spring, finally

rotate the pressure spring in place with the pressure

spring.

7.

Mount the tension spring;

Mount the tension spring with pliers.

Braking System

 Rear Brake (DR)