Mitsubishi Galant. Manual — part 504
BASIC BRAKE SYSTEM DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-7
INSPECTION PROCEDURE 2: Insufficient braking power
DIAGNOSIS
STEP 1. Check whether the brake fluid is low, is the correct
fluid (A/T fluid, engine oil, etc.) or is contaminated (debris,
sand, etc.).
Q: Is there fault?
YES : Refill or replace with the specified brake fluid DOT 3
or DOT 4. Bleed the brakes if necessary (Refer to
NO : Go to Step 2.
STEP 2. Check for spongy (not firm brakes).
(1) With engine not running, depress the brake pedal rapidly
several times to deplete booster vacuum reserve.
(2) With the brake pedal fully released, depress the brake
pedal slowly until it stops.
(3) With a measuring stick (ruler, etc.) next to the brake pedal,
depress the pedal firmly and measure the distance the
pedal traveled.
Q: Is the distance greater than 20 mm (0.8 inch)?
YES : Bleed the brakes to remove air in the fluid (Refer to
NO : Go to Step 3.
STEP 3. Check the lining and brake drum contact.
<Vehicles equipped with rear drum brake>
(1) If equipped with rear disc brake, go to Step 4.
(2) Put chalk on the inner surface of the brake drum. Rub the
lining against the drum inner surface.
NOTE: Clean off chalk after check.
Q: Does the lining wipe off or smudge the chalk across the
full width of the lining?
YES : Go to Step 5.
NO : Replace the shoe and lining assemblies on both
sides. Go to Step 9.
STEP 4. Check the auto adjuster function.
Refer to
.
Q: Is there fault?
YES : Repair it. Then go to Step 9.
NO : Go to Step 5.
STEP 5. Check the brake booster function.
Refer to
.
Q: Is there fault?
YES : Replace the part. Then go to Step 9.
NO : Go to Step 6.
AC000856
BASIC BRAKE SYSTEM DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-8
STEP 6. Check for pinched or restricted brake tube or
hose.
Q: Is there pinched or restricted brake tube or hose?
YES : Replace that complete section of brake tube or brake
hose. Then go to Step 9.
NO : Go to Step 7.
STEP 7. Check for oil, water, etc., on the pad or lining
contact surfaces of all brakes.
Q: Is oil, water, etc., on the pad or lining contact surface?
YES : Replace the part and determine and repair source/
cause of foreign material. Recheck symptom. Then
go to Step 9.
NO : Diagnosis is complete. If condition persists, go to Step
STEP 8. Check the proportioning valve operation.
Refer to
.
Q: Is there fault?
YES : Replace the part. Then go to Step 9.
NO : Go to Step 9.
STEP 9. Recheck symptom.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Start over at step 1. If a new symptom surfaces, refer
to the symptom chart.
INSPECTION PROCEDURE 3: Increased pedal stroke (reduced pedal-to-floor board clearance)
DIAGNOSIS
STEP 1. Check for spongy (not firm brakes).
(1) With engine not running, depress the brake pedal
rapidly several times to deplete booster vacuum
reserve.
(2) With the brake pedal fully released, depress the
brake pedal slowly until it stops.
(3) With a measuring stick (ruler, etc.) next to the
brake pedal, depress the pedal firmly and
measure the distance the pedal traveled.
Q: Is the distance greater than 20 mm (0.8 inch)?
YES :
Bleed the brakes to remove air in the fluid
(Refer to
NO :
Go to Step 2.
STEP 2. Check the pad or lining for wear.
Refer to
or
Q: Is the pad or lining thickness outside of
specifications?
YES :
Replace the part. Then go to Step 8.
NO :
Go to Step 3.
STEP 3. Check the vacuum hose and check valve
for damage.
Refer to
Q: Is there damage?
YES :
Replace the part. Then go to Step 8.
NO :
Go to Step 4.
BASIC BRAKE SYSTEM DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-9
STEP 4. Check the master cylinder function.
Refer to
.
Q: Is there fault?
YES :
Repair it. Then go to Step 8.
NO :
Go to Step 5.
STEP 5. Check for brake fluid leaks.
Q: Is there leaks?
YES :
Check the connection for looseness,
corrosion, etc. Clean and repair as
necessary. If leaking in any tube or hose
section, replace the complete tube or hose.
Then go to Step 8 .
NO :
Go to Step 6.
STEP 6. Check the auto adjuster function.
Refer to
Q: Is there fault?
YES :
Repair the part. Then go to Step 8.
NO :
Go to Step 7.
STEP 7. Check the clearance (too much) between
the pushrod and primary piston.
Refer to
Q: Is the clearance outside of specifications?
YES :
Adjust the clearance. Then go to Step 8.
NO :
Go to Step 8.
STEP 8. Recheck symptom.
Q: Is the symptom eliminated?
YES :
Diagnosis is complete.
NO :
Start over at step 1. If a new symptom
surfaces, refer to the symptom chart.
INSPECTION PROCEDURE 4: Brake drag
DIAGNOSIS
STEP 1. Check the parking brake lever return.
Q: Is there fault?
YES : Repair it. Then go to Step 10.
NO : Go to Step 2.
AC000857AB
<REAR DRUM BRAKE>
<REAR DISC BRAKE>
PARKING
BRAKE
LEVER
PARKING
BRAKE
LEVER
BASIC BRAKE SYSTEM DIAGNOSIS
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BASIC BRAKE SYSTEM
35A-10
STEP 2. Check the parking brake pull amount.
Refer to GROUP 36, On-vehicle Service
−
Parking Brake Lever
Stroke Check and Adjustment
.
Q: Is there fault?
YES : Adjust it. Then go to Step 10.
NO : Go to Step 3.
STEP 3. Check the brake pedal return spring for
deterioration.
Q: Is there deterioration?
YES : Replace the spring. Then go to Step 10.
NO : Go to Step 4.
STEP 4. Check the brake shoe springs for breakage.
Q: Are the brake shoe springs broken?
YES : Replace the spring. Then go to Step 10.
NO : Go to Step 5.
STEP 5. Check the amount of grease at each sliding
section.
Refer to
or refer to GROUP 36, Parking Brake
Drum
Q: Is the grease amount low?
YES : Apply grease. Then go to Step 10.
NO : Go to Step 6.
AC000858
RETURN SPRING
PEDAL SUPPORT
MEMBER
AB
AC000859 AB
<REAR DRUM BRAKE>
<REAR DISC BRAKE>
SHOE
SPRING
SHOE
SPRING
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