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.