Mitsubishi Evolution X. Manual - part 822

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-15

BRAKE BOOSTER OPERATION CHECK

M1351001000822

.

INSPECTION WITHOUT USING TESTER

1. Carry out the simplified brake booster operation check in the 

following procedure:

AC000870AC

Good

No good

Once

Second

Third

(1) Run the engine for 1 to 2 minutes, and then stop. 

Depress the brake pedal with normal depression force. 
The result is judged as "Good" when the pedal stroke is 
great at the first depression, and becomes smaller as you 
repeat depressing the pedal. If the pedal stroke does not 
change, the result is judged as "No Good."

AC000871AC

When engine
is stopped

When engine
is started

(2) With the engine stopped, depress the brake pedal 

several times. Keep the brake pedal depressed and start 
the engine. At this time, when the pedal moves down 
slightly, the result is judged as "Good." The result is 
judged as "No Good" if the pedal does not move down.

AC000872 AC

Good

No good

(3) With the engine running, depress the brake pedal. Stop 

the engine in this condition. The result is judged as 
"Good" when the pedal height does not change for 
approximately 30 seconds. The result is judged as "No 
Good" if the pedal moves up.

2. The brake booster is judged as normal when the results of 

all the above checks are "Good."
When one or more of the above check results are "No 
Good," then the check valve, vacuum hose, or brake booster 
is suspected faulty.

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-16

CHECK VALVE OPERATION CHECK

M1351009000815

1. Remove the check valve (Refer to 

P.35A-27

).

CAUTION

Replace the check valve when it is faulty.

AC508114

Valve

Spring

Intake 
manifold
side

Booster side

(1)

(2)

AB

2. Using a vacuum pump, check operation of the check valve. 

Vacuum pump 
connection

Normal condition

When connected to the 
booster side (1)

Vacuum is generated 
and maintained.

When connected to the 
engine side (2)

No vacuum is generated.

BLEEDING

M1351001401027

CAUTION

Be sure to use the specified brand and type of brake fluid. 
Avoid mixing with other type of brake fluid.

Brake fluid: DOT3 or DOT4

.

BLEEDING OF BRAKE PIPELINE 

AC607428AE

1

2

3

4

Front of
vehicle

Perform the bleeding in the order shown in the figure.

.

DISK BRAKE BLEEDING

CAUTION

Take care not to contact the parts or tools to the caliper 
because the paint of caliper will be scratched. And if there 
is brake fluid on the caliper, wipe it off quickly.

AC211983AC

Bleeder screws

Connect a vinyl tube to the outer end of the air bleeder screws 
to bleed the circuit of air. Then, connect the vinyl tube to the 
inner end and bleed the circuit of air. Except for these, the con-
ventional procedures shall be followed. After the circuit has 
been bled of air, tighten both air bleeder screws securely.

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-17

BRAKE FLUID LEVEL SWITCH CHECK

M1351009100801

AC707397AB

Reservoir assembly

The brake fluid level switch is normal when the following condi-
tions are met: When the brake fluid level is above "MIN," conti-
nuity is detected; and when the level is below "MIN," no 
continuity is detected.

BRAKE PAD CHECK

M1351017300048

CAUTION

If there is a significant difference in the thicknesses of the 
pads on the left and right sides, check moving parts (Refer 
to 

P.35A-21

).

AC706942AB

<Front>

AC706943AB

<Rear>

1. Visually check the thickness of brake pad from the 

inspection hole of the caliper body.

Standard value:

9.85 mm (0.39 inch) <Front>
9.0 mm (0.35 inch) <Rear>

Limit:

2.0 mm (0.08 inch) <Front>
2.0 mm (0.08 inch) <Rear>

2. When the thickness is lower than the limit value, replace 

both brake pads (right and left) as a set (Refer to 

P.35A-18

).

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-18

BRAKE PAD REPLACEMENT

M1351017400056

.

CAUTION

• Take care not to contact the parts or tools to the caliper 

because the paint of caliper will be scratched. And if 
there is brake fluid on the caliper, wipe it off quickly.

• Whenever a pad must be replaced, replace both LH and 

RH wheel pads as a set to prevent the vehicle from pull-
ing to one side when braking.

AC211986AB

Cross 
spring

Pin

1. While pressing the cross spring by hand, remove the pin 

from the brake caliper assembly.

2. Remove the cross spring from the brake caliper assembly.

AC710737

1

1

1

2

2

1

1

2

1

1

1

2

AB

<Right side>

Vehicle out side

Vehicle out side

<Left side>

<Front disc brake>

Wear indicator

Wear indicator

<Right side>

Vehicle out side

Vehicle out side

<Left side>

<Rear disc brake>

Wear indicator

Wear indicator