Mitsubishi Evolution X. Manual - part 819

SERVICE SPECIFICATIONS

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BASIC BRAKE SYSTEM

35A-3

SERVICE SPECIFICATIONS

M1351000301403

Item

Standard value

Limit

Brake pedal height mm (in)

219.8 

− 227.8  

(8.7 

− 9.0)

−

Dimension from the brake booster stud bolt end to the clevis 
hole center mm (in)

74 (2.91)

−

Brake pedal free play mm (in)

3 

− 8 (0.12 − 0.31)

−

Pedal-to-floor clearance when brake pedal is depressed mm (in)

 

[Pedal depression force: approx. 500 N]

85 (3.35) or more

−

Front disk brake

Pad thickness mm (in)

9.85 (0.39)

2.0 (0.08)

Brake disk thickness mm (in)

32.0 (1.26)

30.0 (1.18)

Brake disk runout mm (in)

−

0.06 (0.0024)

Brake drag force N (lb)

68 (15.3) or less

−

Rear disk brake

Pad thickness mm (in)

9.0 (0.35)

2.0 (0.08)

Brake disk thickness mm (in)

22.0 (0.87)

20.0 (0.79)

Brake disk runout mm (in)

−

0.08 (0.0032)

Brake drag force N (lb)

68 (15.3) or less

−

Brake pedal distortion mm (in)

M/T

240 

− 246 

(9.4 

− 9.7)

−

TC-SST

242 

− 248 

(9.5 

− 9.8)

−

Front brakes Type (Disk brake nomenclature)

Brembo

™ 4-opposed-piston ventilated disk 

(V8-Z4046)

Disk effective dia 

×  thickness mm (in)

294 

×  32 (11.6 ×  1.3)

Cylinder I.D. mm (in)

40.0 (1.58) 

×  2, 46.0 (1.81) ×  2

Brake pad thickness mm (in)

9.85 (0.39)

Clearance adjustment

Automatic adjustment

Rear brakes Type (Disk brake nomenclature)

Brembo

™ 2-opposed-piston ventilated disk 

(V7-X40)

Disk effective dia 

×  thickness mm (in)

278 

×  22 (10.9 ×  0.9)

Cylinder I.D. mm (in)

40.0 (1.58) 

×  2

Brake pad thickness mm (in)

9.0 (0.35)

Clearance adjustment

Automatic adjustment

Brake fluid

DOT3 or DOT4

Item

Specification

LUBRICANTS

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BASIC BRAKE SYSTEM

35A-4

LUBRICANTS

M1351000401002

Item

Specified lubricant

Quantity

Brake fluid

DOT3 or DOT4

Adequate

Brake pad assembly (between pad and 
shim)

Repair kit grease, Molykote AS880N or equivalent

Brake pad assembly (shoulder section)

Repair kit grease, Molykote 7439 or equivalent

BASIC BRAKE SYSTEM DIAGNOSIS

INTRODUCTION TO BASIC BRAKE SYSTEM DIAGNOSIS

M1351009700405

Hydraulic brakes are composed of the brake pedal, 
master cylinder, brake booster and disk brakes. Mal-
functions such as insufficient braking power or the 
generation of noise may occur due to wear, damage 
or incorrect adjustment of these components.

BASIC BRAKE SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1351009800383

Use these steps to plan your diagnostic strategy. If 
you follow them carefully, you will be sure that you 
have exhausted most of the possible ways to find a 
basic brake system fault.
1. Gather information from the customer.

2. Verify that the condition described by the 

customer exists.

3. Find the malfunction by following the symptom 

chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART

M1351009900410

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

Vehicle pulls to one side when brakes are applied

1

P.35A-5

Insufficient braking power

2

P.35A-5

Increased pedal stroke (Reduced pedal-to-floor board clearance) 3

P.35A-6

Brake drag

4

P.35A-7

Scraping or grinding noise when brake are applied

5

P.35A-8

Squealing, groaning or chattering noise when brake are applied

6

P.35A-9

Squealing noise when brakes are not applied

7

P.35A-10

Groaning, clicking or rattling noise when brakes are not applied

8

P.35A-11

BASIC BRAKE SYSTEM DIAGNOSIS

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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-35

, Rear: 

refer to 

P.35A-40

). 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

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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 5.

NO : 

Go to Step 2.

STEP 2. Check the pad for wear.
Refer to 

P.35A-17

.

Q: Is the pad thickness outside of specifications?

YES : 

Replace the part. Then go to Step 5.

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 5.

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 5  .

NO : 

Go to Step 5.

STEP 5. 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.