Mitsubishi 380. Manual — part 293

BASIC BRAKE SYSTEM DIAGNOSIS

BASIC BRAKE SYSTEM

35A-6

INSPECTION PROCEDURE 4: Brake Drag

.

DIAGNOSIS

STEP 1. Check the parking brake operating lever return.
Q: Is the operation faulty?

YES : Repair it. Then go to Step 9.
NO : Go to Step 2.

STEP 2. Check the brake shoe springs for breakage.
Q: Are the brake shoe springs broken?

YES : Replace the spring. Then go to Step 9.
NO : Go to Step 3.

STEP 3. Check the amount of grease at each sliding
section.
Refer to GROUP 36, Parking Brake Lining and Drum

P.36-8

.

Q: Is the grease amount low?

YES : Apply grease. Then go to Step 9.
NO : Go to Step 4.

STEP 4. Check the parking brake pull amount.
Refer to GROUP 36, On-vehicle Service

− Parking Brake lever

Stroke Check and Adjustment

P.36-3

.

Q: Is there a fault?

YES : Adjust it. Then go to Step 9.
NO : Go to Step 5.

STEP 5. Check for insufficient clearance between the push
rod and primary piston.
Refer to

P.35A-26

.

Q: Is there a fault?

YES : Adjust the clearance. Then go to Step 9.
NO : Go to Step 6.

AC210519AB

PARKING BRAKE
OPERATING LEVER

AC210519AC

SHOE
SPRINGS

BASIC BRAKE SYSTEM DIAGNOSIS

BASIC BRAKE SYSTEM

35A-7

STEP 6. Check the master cylinder piston return spring for
damage and return port for clogging.
Refer to

P.35A-28

.

Q: Is there damage?

YES : Replace the part. Then go to Step 9.
NO : Go to Step 7.

STEP 7. Check port for clogging.

Q: Is the port clogged?

YES : Repair it. Then go to Step 9.
NO : Go to Step 8.

STEP 8. Check disc brake pistons for sticking.
Depress the brake pedal, then release. Confirm each wheel
spins freely.

Q: Does any wheel stick?

YES : Inspect that brake assembly. Then go to Step 9.
NO : Go to Step 9.

STEP 9. Recheck symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Start over at step 1. If a new symptom surfaces, refer

to the symptom chart.

INSPECTION PROCEDURE 5: Scraping or Grinding Noise when Brakes are Applied

.

DIAGNOSIS

STEP 1. Check the front brakes, then rear brakes, for
metal-to-metal condition.

Q: Is any metal-to-metal contact evident?

YES : Repair or replace the components. Then go to Step 6.
NO : Go to Step 2.

STEP 2. Check for interference between the caliper and
wheel.

Q: Is there any interference?

YES : Repair or replace the part. Then go to Step 6.
NO : Go to Step 3.

BASIC BRAKE SYSTEM DIAGNOSIS

BASIC BRAKE SYSTEM

35A-8

STEP 3. Check for interference between the dust cover and
brake disc.
Q: Is there any interference?

YES : Repair or replace the part. Then go to Step 6.
NO : Go to Step 4.

STEP 4. Check the brake drums or discs for cracks.

Q: Are there cracks?

YES : Repair or replace the part. Then go to Step 6.
NO : Go to Step 5.

STEP 5. Check for bent backing plate(s).
Q: Is (Are) the backing plate(s) bent?

YES : Repair or replace the part. Then go to Step 6.
NO : Go to Step 6.

STEP 6. Recheck symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Start over at step 1. If a new symptom surfaces, refer

to the symptom chart.

INSPECTION PROCEDURE6: Squealing, Groaning or Chattering Noise when Brakes are Applied

.

DIAGNOSIS

STEP 1. Check the brake disc and pads for wear
or cutting.

Q: Is there wear or cutting?

YES :

Repair or replace the part. Then go to Step

4.

NO :

Go to Step 2.

STEP 2. Check the calipers for rust.

Q: Is there any rust?

YES :

Remove the rust. Then go to Step 4.

NO :

Go to Step 3.

15DB177A

DUST COVER

BRAKE DISC

<FRONT> <REAR>

AC210519AD

BACKING PLATE

<REAR>

BASIC BRAKE SYSTEM DIAGNOSIS

BASIC BRAKE SYSTEM

35A-9

STEP 3. Adjust the brake pedal or brake booster
pushrod.
Refer to

P.35A-13

or

P.35A-26

.

Q: Are the brake pedal and the brake booster pushrod

adjusted correctly?
YES :

Go to Step 4.

NO :

Adjust the brake pedal or the brake booster
pushrod. Then go to Step 4.

STEP 4. Recheck symptom.

Q: Is the symptom eliminated?

YES :

The procedure is complete.

NO :

Start over at step 1. If a new symptom
surfaces, refer to the symptom chart.

INSPECTION PROCEDURE 7: Squealing Noise when Brakes are not Applied

DIAGNOSIS

.

STEP 1. Check whether the backing plate is bent or loose
and interfering with the drum.

Q: Is there a fault?

YES : Replace the part. Then go to Step 10.
NO : Go to Step 2.

STEP 2. Check whether the drum is damaged due to
interference with the backing plate or shoe.

Q: Is there any damage?

YES : Replace the part. Then go to Step 10.
NO : Go to Step 3.

STEP 3. Check the brake drum for wear and the shoe
spring for damage.

Q: Is there any wear or damage?

YES : Replace the part. Then go to Step 10.
NO : Go to Step 4.

STEP 4. Check the brake discs for rust.

Q: Are the brake discs rusted?

YES : Remove the rust by using sand paper. If still rusted,

turn the rotors with an on-the-car brake lathe. Then go
to Step 10.

NO : Go to Step 5.

STEP 5. Check the brake pads for correct installation.

Q: Are the pads installed incorrectly?

YES : Repair the pads. Then go to Step 10.
NO : Go to Step 6.

STEP 6. Check the calipers for correct installation.

Q: Are the calipers installed incorrectly?

YES : Repair the calipers. Then go to Step 10.
NO : Go to Step 7.