Mitsubishi Galant (2004+). Manual - part 507

 

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Mitsubishi Galant (2004+). Manual - part 507

 

 

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-15

(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-15

), vacuum hose for leaks, high volume engine 

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

CHECK VALVE OPERATION CHECK

M1351009000376

CAUTION

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

P.35A-26

).

CAUTION

If the check valve is defective, replace it as an assembly 
together with the vacuum hose.
2. Check the operation of the check valve by using a vacuum 

pump.

AC000871 AB

WHEN ENGINE
IS STOPPED

WHEN ENGINE
IS STARTED

AC000872

GOOD

NO GOOD

AB

VACUUM PUMP 
CONNECTION

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.

AC000873 AB

A

B

VALVE

SPRING

INTAKE
MANIFOLD
SIDE
(DOES NOT
HOLD)

BOOST-
ER SIDE
(HOLDS)

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-16

PROPORTIONING VALVE FUNCTION TEST 
<VEHICLES WITHOUT ABS>

M1351001100346

CAUTION

The proportioning valves are installed independently for 
the right and left brake lines. Always measure each valve.
1. Connect two pressure gauges to the output port of the 

master cylinder and output port of the proportioning valve.

2. Bleed the brake line and the pressure gauges (Refer to 

P.35A-16

).

3. Depress the brake pedal gradually. Then check that the split 

point, where the output fluid pressure begins to drop in 
proportion to the output fluid pressure, is at the standard 
value.

Standard value: 3.68 

 4.17 MPa (534  605 psi)

4. Depress the brake pedal more strongly than at the above 

step. Then check that the output fluid pressure is at the 
standard value when the input fluid pressure is 7.85 MPa 
(1,139 psi).

Standard value: 5.24 

 5.74 MPa (760  833 psi)

5. Measure each output fluid pressure at both valves, and 

check that the difference between the two is at the limit 
value or less.

Limit: 0.5 MPa (73 psi)

6. If the measured pressure exceeds the limit, replace the 

proportioning valve.

BLEEDING

M1351001400455

CAUTION

Use only brake fluid DOT 3 or DOT 4. Never mix the speci-
fied brake fluid with other fluid as it will influence the brak-
ing 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 con-
tained in the master cylinder).
1. Fill the reserve tank with brake fluid.
2. Keep the brake pedal depressed.

AC006221AD

PROPORTIONING
VALVE

OUTPUT PORT

PRESSURE GAUGE (A)

PRESSURE GAUGE (B)

OUTPUT PORT

AC006222 AB

SPLIT POINT

INPUT PRESSURE
<PRESSURE GAUGE (A)>

OUTPUT
PRESSURE
<PRESSURE
GAUGE (B)>

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-17

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.

AC306134AB

OUTLET

OUTLET

OUTLET

VEHICLES WITH ABS

VEHICLES WITHOUT ABS

AC006223 AB

4

2

1

3

4, 6

2

1, 3

5

VEHICLES WITH ABS

VEHICLES WITHOUT ABS

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-18

BRAKE FLUID LEVEL SENSOR CHECK

M1351009100403

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

M1351002300398

NOTE: The brake pads (LH wheel) have indicators that contact 
the brake disc when the brake pad thickness becomes 2 mm 
(0.08 inch), 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 pull-
ing 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 (0.39 inch)
Minimum limit: 2.0 mm (0.08 inch)

AC305546

AC000879

WHEN NEW

WHEN WORN

AB

PAD

WEAR INDICATOR

BRAKE
DISC

AC305371

AB

<FRONT>

AC305372

AB

<REAR>

 

 

 

 

 

 

 

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