Mitsubishi Galant. Manual — part 507
ON-VEHICLE SERVICE
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BASIC BRAKE SYSTEM
35A-19
(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
.), 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
M1351009000064
CAUTION
The check valve should not be removed from the vacuum
hose.
1. Remove the vacuum hose. (Refer to
AC000870
GOOD
NO GOOD
AB
AC000871AB
WHEN ENGINE
IS STOPPED
WHEN ENGINE
IS STARTED
AC000872
GOOD
NO GOOD
AB
ON-VEHICLE SERVICE
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BASIC BRAKE SYSTEM
35A-20
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.
PROPORTIONING VALVE FUNCTION TEST
M1351001100067
1. Connect two pressure gauges, one each to the input side
and output side of the proportioning valve, as shown.
2. Air bleed the brake line and the pressure gauge.
3. While gradually depressing the brake pedal, make the
following measurements and check to be sure that the
measured values are within the allowable range.
(1) Output fluid pressure begins to drop relative to input fluid
pressure (split point).
Standard value: 2.7
−−−−
3.2 MPa (391
−−−−
462 psi)
(2) Check that the output fluid pressure is at standard value
when the input fluid pressure indicates 9.8 MPa (1,422
psi).
Standard value: 4.3
−−−−
5.1 MPa (619
−−−−
732 psi)
(3) Output fluid pressure difference between left and right
brake lines.
Limit: 0.4 MPa (57 psi)
4. If the measured fluid pressures are not within allowable
ranges, replace the proportioning valve.
VACUUM PUMP CONNEC-
TION
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.
AC000873AB
A
B
VALVE
SPRING
INTAKE
MANIFOLD
SIDE
(DOES NOT
HOLD)
BOOST-
ER SIDE
(HOLDS)
AC000874
PRESSURE GAUGE
PROPORTIONING VALVE
AB
AC000875AB
INPUT FLUID PRESSURE
OUTPUT
FLUID
PRESSURE
SPLIT POINT
ON-VEHICLE SERVICE
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BASIC BRAKE SYSTEM
35A-21
BLEEDING
M1351001400080
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 reserve tank with brake fluid.
2. Keep the brake pedal depressed.
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
CAUTION
For vehicles equipped with ABS, be sure to filter/strain the
brake fluid being added to the master cylinder reservoir
tank. Debris may damage the hydraulic unit.
Start the engine and bleed the air in the sequence shown in the
figure.
BRAKE FLUID LEVEL SENSOR CHECK
M1351009100061
The brake fluid level sensor is in good condition if there is no
continuity when the float surface is above "A" and if there is
continuity when the float surface is below "A."
AC000876
AC000877
4
1
2
3
AB
AC000878AB
A
ON-VEHICLE SERVICE
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BASIC BRAKE SYSTEM
35A-22
DISC BRAKE PAD CHECK AND REPLACEMENT
M1351002300053
NOTE: The brake pads 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
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, lock pin, and guide pin.
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)
CAUTION
Do not wipe the special grease from the guide pin. Do not
contaminate the guide pin.
2. Remove the guide pin. Lift the caliper assembly and secure
it with a wire.
3. Remove the following parts from caliper support.
<FRONT (2.4L ENGINE)>
(1) Pad and wear indicator assembly
(2) Inner shim B
(3) Inner shim A
(4) Pad assembly
(5) Outer shim B
(6) Outer shim A
(7) Clip
AC000879
WHEN NEW
WHEN WORN
AB
PAD
WEAR INDICATOR
BRAKE
DISC
AC001589
AC000881
AC000882 AC
7
4
6
5
7
2
3
1
<FRONT (2.4L ENGINE)>
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