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

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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

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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

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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