Mitsubishi Lancer Evolution X. Manual - part 125

 

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Mitsubishi Lancer Evolution X. Manual - part 125

 

 

BASIC BRAKE SYSTEM DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-5

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Vehicle Pulls to One Side when Brakes are Applied

DIAGNOSIS

STEP 1. Check for oil, water, etc., on the pad 
contact surface of all brakes.

Q: Is oil, water, etc., on the pad contact surface?

YES : 

Replace the part and determine the 

source/cause of foreign material. Then go to 
Step 5.

NO : 

Go to Step 2.

STEP 2. Check disk brake pistons for smooth 
operation.
(1) With engine not running, depress the brake pedal 

rapidly several times to deplete booster vacuum 
reserves.

(2) Test each disk brake assembly one at a time.

a. Remove the lower caliper bolt, then remove 

caliper from mount.

b. Have an assistant slowly depress the brake 

pedal. Confirm piston(s) extend slowly and 
smoothly with no jumpiness. Repeat for each 
disk brake assembly.

Q: Do (does) the piston(s) move correctly?

YES : 

Go to Step 3.

NO : 

Disassemble and inspect the brake 
assembly (Front: refer to 

P.35A-32

, Rear: 

refer to 

P.35A-37

). Then go to Step 5.

STEP 3. Check brake disk(s) for runout.
Refer to 

P.35A-21

.

Q: Is runout outside of specifications?

YES : 

Repair or replace the brake disk(s) as 

necessary. Then go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check brake disks for correct thickness.
Refer to 

P.35A-21

.

Q: Is the thickness outside of specifications?

YES : 

Repair or replace the brake disk(s) as 

necessary. Then go to Step 5.

NO : 

Perform the brake line bleeding. Then go to 
Step 5.

STEP 5. Retest the system.

Q: Is the symptom eliminated?

YES : 

The procedure is complete.

NO : 

Start over at Step 1. If a new symptom 
appears, refer to the appropriate symptom 
chart.

INSPECTION PROCEDURE 2: Insufficient Braking Power

DIAGNOSIS

STEP 1. Check that the specified brake fluid is 
used, its level is correct, and no contamination is 
found.

Q: Is there a fault?

YES : 

Refill or replace with the specified brake 

fluid DOT 3 or DOT 4. Bleed the brakes if 
necessary (Refer to 

P.35A-16

). Then go to 

Step 6. 

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 the booster 
vacuum reserve.

(2) With the brake pedal fully released, depress the 

brake pedal slowly until it stops.

(3) With a measuring device (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 

P.35A-16

). Then go to Step 6.

NO : 

Go to Step 3. 

BASIC BRAKE SYSTEM DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-6

STEP 3. Check the brake booster function.
Refer to 

P.35A-15

.

Q: Is there a fault?

YES : 

Replace the brake booster. Then go to Step 

6.

NO : 

Go to Step 4.

STEP 4. Check for pinched or restricted brake 
tube or hose.

Q: Is there a pinched or restricted brake tube or hose?

YES : 

Replace that complete section of brake tube 

or brake hose. Then go to Step 6.

NO : 

Go to Step 5.

STEP 5. Check for oil, water, etc., on the pad 
contact surfaces of all brakes.

Q: Is oil, water, etc., on the pad contact surface?

YES : 

Replace the part and determine the 

source/cause of foreign material. Recheck 
symptom. Then go to Step 6.

NO : 

The procedure is complete. Then 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 appropriate 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 device (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 

P.35A-16

). Then go to Step 6.

NO : 

Go to Step 2.

STEP 2. Check the pad for wear.
Refer to 

P.35A-18

.

Q: Is the pad thickness outside of specifications?

YES : 

Replace the part. Then go to Step 6.

NO : 

Go to Step 3.

STEP 3. Check the vacuum hose and check valve 
for damage.
Refer to 

P.35A-16

.

Q: Is there a damage?

YES : 

Replace the part. Then go to Step 6.

NO : 

Go to Step 4.

STEP 4. Check for brake fluid leaks.

Q: Is there a leak?

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 6 .

NO : 

Go to Step 5.

STEP 5. Check the master cylinder assembly.
(1) Remove the master cylinder assembly (Refer to 

P.35A-26

).

(2) Check for brake fluid leaks from the master 

cylinder assembly seal.

Q: Is a brake fluid leaking from the master cylinder 

assembly seal present?
YES : 

Replace the master cylinder assembly and 

the brake booster assembly (Refer to 

P.35A-26

). 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.

BASIC BRAKE SYSTEM DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-7

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 7.
NO :  Go to Step 2.

STEP 2. Check the shoe-to-anchor springs and adjusting 
wheel spring for breakage.
Q: Are the shoe-to-anchor springs and adjusting wheel 

spring broken?
YES : 
Replace the spring. Then go to Step 7.
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.36-14

.

Q: Is the grease amount low?

YES : Apply grease. Then go to Step 7.
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.36-8

.

Q: Is there a fault?

YES : Adjust it. Then go to Step 7.
NO :  Go to Step 5.

STEP 5. Check port for clogging.
Q: Is the port clogged?

YES : Repair it. Then go to Step 7.
NO :  Go to Step 6.

AC709382

Parking brake 
operating lever

AB

AC709382

Shoe-to-anchor 
springs

Adjusting wheel spring

AC

BASIC BRAKE SYSTEM DIAGNOSIS

TSB Revision

BASIC BRAKE SYSTEM

35A-8

STEP 6. Check disk 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 7.
NO :  Go to Step 7.

STEP 7. 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.

STEP 3. Check for interference between the dust cover and 
brake disk.
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 disks for cracks.
Q: Are there cracks?

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

 

 

 

 

 

 

 

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