Mitsubishi Grandis. Manual - part 891

 

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Mitsubishi Grandis. Manual - part 891

 

 

ON-VEHICLE SERVICE

BASIC BRAKE SYSTEM

35A-6

(1) Run the engine for one or two minutes, and 

then stop it. If the pedal depresses fully the 
first time but gradually becomes higher when 
depressed succeeding times, the booster is 
operating properly. If the pedal height remains 
unchanged, the booster is defective. Go to 
step 2.

(2) With the engine stopped, step on the brake 

pedal several times. Then step on the brake 
pedal and start the engine. If the pedal moves 
downward slightly, the booster is in good 
condition. If there is no change, the booster is 
defective. Go to step 3.

(3) With the engine running, step on the brake 

pedal and then stop the engine. Hold the 
pedal depressed for 30 seconds. If the pedal 
height does not change, the booster is in good 
condition, if the pedal rises, the booster is 
defective.

2. If the above three tests are okay, the booster is 

OK. If one of the above three tests is not okay, the 
check valve, vacuum hose, or booster is 
defective. Check the check valve (Refer to 

P.35A-6

), vacuum hose for leaks, high volume 

engine vacuum applied to booster. Repair or 
replace as necessary. If these are OK, replace the 
booster and repeat this test starting at Step 1.

CHECK VALVE OPERATION CHECK

M1351009000451

CAUTION

The check valve should not be removed from the 
vacuum hose.
1. Remove the vacuum hose (Refer to 

P.35A-14

).

CAUTION

If the check valve is defective, replace it as an 
assembly unit together with the vacuum hose.

2. Check the operation of the check valve by using a 

vacuum pump.

BLEEDING

M1351001400563

CAUTION

Use only brake fluid DOT 3 or DOT 4. Never mix 
the specified brake fluid with other fluid as it will 
influence the braking performance significantly.

MASTER CYLINDER BLEEDING

The master cylinder used has no check valve, so if 
bleeding is carried out by the following procedure, 
bleeding of air from the brake pipeline will become 
easier (When brake fluid is not contained in the 
master cylinder).
1. Fill the reservoir with brake fluid.
2. Keep the brake pedal depressed.

AC000871AE

When engine
is stopped

When engine
is started

AC000872

Good

No good

AE

Vacuum pump 
connection

Accept/reject criteria

Connection at the brake 
booster side (A)

A negative pressure 
(vacuum) is created and 
held.

Connection at the intake 
manifold side (B)

A negative pressure 
(vacuum) is not created.

AC000873AE

A

B

Valve

Spring

Intake manifold
side
(does not hold)

Booster side
(holds)

ON-VEHICLE SERVICE

BASIC BRAKE SYSTEM

35A-7

3. Have another person cover the master cylinder 

outlet with a finger.

4. With the outlet still closed, release the brake 

pedal.

5. Repeat steps 2 

− 4 three or four times to fill the 

inside of the master cylinder with brake fluid.

BRAKE LINE BLEEDING

Start the engine and bleed the air in the sequence 
shown in the figure.

BRAKE FLUID LEVEL SENSOR CHECK

M1351009100458

The brake fluid level sensor is in good condition if 
there is no continuity when the float surface is above 
"MIN" and if there is continuity when the float surface 
is below "MIN".

DISC BRAKE PAD CHECK AND 
REPLACEMENT

M1351002300495

NOTE: 

The brake pads have indicators that contact the 
brake disc when the brake pad thickness becomes 2 
mm, and emit a squealing sound to warn the driver.

CAUTION

• Whenever a pad must be replaced, replace 

both LH and RH wheel pads as a set to 
prevent the vehicle from pulling to one side 
when braking.

• If there is a significant difference in the 

thicknesses of the pads on the left and right 
sides, check the sliding condition of the 
piston and slide pins.

1. Check the brake pad thickness through the caliper 

body check port.

Standard value: 10.0 mm
Minimum limit: 2.0 mm

AC302063

AC

Master cylinder

AC301228AB

4

2

1

3

AC311385 AB

AC000879

When new

When worn

AD

Pad

Wear indicator

Brake
disc

AC311390 AB

<Front>

<Rear>

ON-VEHICLE SERVICE

BASIC BRAKE SYSTEM

35A-8

CAUTION

Do not wipe off the special grease that is on the 
lock pin or allow it to contaminate the lock pin.

2. Remove the guide/lock pin bolt. Pivot the caliper 

assembly and hold it with wires.

3. Remove the following parts from caliper support.

(1) Shim
(2) Pad assembly or Pad and wear indicator 

assembly

(3) Pad clip

4. In order to measure the brake drag force after pad 

installation, measure the rotary-sliding resistance 
of the hub with the pads removed. For the front 
brakes, refer to 

P.35A-18

. For the rear brakes, 

refer to 

P.35A-23

.

5. Install the pads and caliper assembly, and then 

check the brake drag force. For the front brakes, 
refer to 

P.35A-18

. For the rear brakes, refer to 

P.35A-23

.

DISC BRAKE ROTOR CHECK

M1351002900419

CAUTION

Disc brakes must be kept within the allowable 
service values in order to maintain normal brake 
operation.
Before turning the brake disc, the following 
conditions should be checked.

AC311391AB

<Front>

<Rear>

Guide pin

Lock pin

AC313232 AB

2

1

2

3

2

1

1

1

<Front>

<Rear>

3

3

2

ON-VEHICLE SERVICE

BASIC BRAKE SYSTEM

35A-9

BRAKE DISC THICKNESS CHECK

1. Using a micrometer, measure disc thickness at 

eight positions, approximately 45

° apart and 10 

mm in from the outer edge of the disc.
Standard value:

<Front> 26.0 mm
<Rear> 10.0 mm

Minimum limit:

<Front> 24.4 mm
<Rear> 8.4 mm

NOTE: Thickness variation (at least 8 positions) 
should not be more than 0.015 mm.

Inspection item

Remark

Scratches, rust, saturated lining materials and wear

• If the vehicle is not driven for a long period of 

time, sections of the discs that are not in contact 
with the pads will become rusty, causing noise 
and shuddering.

• If grooves and scratches resulting from excessive 

disc wear are not removed prior to installing a new 
pad assembly, there will be inadequate contact 
between the disc and the lining (pad) until the 
pads conform to the disc.

Run-out

Excessive run-out of the discs will increase the pedal 
depression resistance due to piston kick-back.

Change in thickness (parallelism)

If the thickness of the disc changes, this will cause 
pedal pulsation, shuddering and surging.

Inset or warping (flatness)

Overheating and improper handling while servicing 
will cause warping or distortion.

ACX00668

 

 

 

 

 

 

 

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