Mitsubishi Galant 9G. Manual — part 407

ON-VEHICLE SERVICE

TSB Revision

BASIC BRAKE SYSTEM

35A-20

3. Remove the following parts from the caliper support.

(1) Pad assembly
(2) Pad and wear indicator assembly or Pad assembly
(3) Shim
(4) Clip

4. In order to measure the brake drag force after pad

installation, measure the rotary-sliding resistance of the hub
with the pads removed (Refer to

P.35A-30

).

5. Install the pads and caliper assembly, and then check the

brake drag force (Refer to

P.35A-30

).

DISC BRAKE ROTOR CHECK

M1351002900334

CAUTION

Disc brakes must be kept within the allowable
service values in order to maintain normal brake
operation.
Before turning the brake disc, the following condi-
tions should be checked.

.

AC308592

3

2

1

4

AB

3

2

1

4

4

<FRONT>

<REAR>

3

4

3

INSPECTION ITEM

REMARK

Scratches, rust, saturated lining materials and wear

• If the vehicle is not driven for a long period of

time, sections of the discs that are not in contact
with the pads will become rusty, causing noise
and shuddering.

• If grooves and scratches resulting from excessive

disc wear are not removed prior to installing a new
pad assembly, there will be inadequate contact
between the disc and the lining (pad) until the
pads conform to the disc.

Run-out

Excessive run-out of the discs will increase the pedal
depression resistance due to piston kick-back.

Change in thickness (parallelism)

If the thickness of the disc changes, this will cause
pedal pulsation, shuddering and surging.

Inset or warping (flatness)

Overheating and improper handling while servicing
will cause warping or distortion.

ON-VEHICLE SERVICE

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BASIC BRAKE SYSTEM

35A-21

BRAKE DISC THICKNESS CHECK

1. Using a micrometer, measure disc thickness at eight

positions, approximately 45 degrees apart and 10 mm (0.4
inch) in from the outer edge of the disc.

FRONT BRAKE DISC

Standard value: 26.0 mm (1.02 inches)
Minimum limit: 24.4 mm (0.96 inch)

REAR BRAKE DISC

Standard value: 10.0 mm (0.39 inch)
Minimum limit: 8.4 mm (0.33 inch)

NOTE: Thickness variation (at least 8 positions) should not
be more than 0.015 mm (0.0006 inch).

CAUTION

• After a new brake disc is installed, always grind the

brake disc with an on-the-car type brake lathe. If this
step is not carried out, the brake disc run-out exceeds
the specified value, resulting in judder.

• When the on-the-car type lathe is used, first install a

M12 flat washer on the stud bolt in the brake disc side
according to the figure, and then install the adapter. If
the adapter is installed with M12 flat washer not seated,
the brake disc rotor may be deformed, resulting in inac-
curate grinding.

• Grind the brake disc with all wheel nuts diagonally and

equally tightened to the specified torque 100 N

⋅m (74

ft-lb). If all of the wheel nuts are not used, or the tight-
ening torque is excessive or not equal, the brake disc
rotor or drum may be deformed, resulting in judder.

2. If the disc thickness is less than the limit, replace it with a

new one. If thickness variation exceeds the specification,
turn rotor with an on-the-car type brake lathe
("Accuturn-8750" or equivalent). If the calculated final
thickness after turning the rotor is less than the standard
value, replace the disc.

.

ACX00668AB

AC006226 AB

M12 FLAT WASHER

M12 FLAT WASHER

ON-VEHICLE SERVICE

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BASIC BRAKE SYSTEM

35A-22

BRAKE DISC RUN-OUT CHECK AND
CORRECTION

1. Remove the brake assembly, and then hold it with wire.
2. Temporarily install the disc with the hub nut.
3. Place a dial gauge approximately 5 mm (0.2 inch) from the

outer circumference of the brake disc, and measure the
run-out of the disc.

Limit:

<Front brake disc>: 0.10 mm (0.0039 inch)
<Rear brake disc>: 0.04 mm (0.0016 inch)

4. If the brake disc run-out exceeds the limit, correct it as

follows:

(1) Chalk phase marks on the wheel stud and the brake disc

as shown.

(2) Remove the brake disc. Then place a dial gauge as

shown, and measure the end play while moving the hub
in the axial direction.

Limit: 0.05 mm (0.002 inch)

(3) If the end play exceeds the limit, replace the hub

assembly.

(4) If the end play does not exceed the limit, dephase the

brake disc and secure it. Then recheck the brake disc
run-out.

ACX00669AB

AC210711AB

CHALK MARKS

AC102438 AC

<FRONT>

AC205869AC

<REAR>

ON-VEHICLE SERVICE

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BASIC BRAKE SYSTEM

35A-23

CAUTION

• After a new brake disc is installed, always grind the

brake disc with an on-the-car type brake lathe. If this
step is not carried out, the brake disc run-out exceeds
the specified value, resulting in judder.

• When the on-the-car type lathe is used, first install a

M12 flat washer on the stud bolt in the brake disc side
according to the figure, and then install the adapter. If
the adapter is installed with M12 flat washer not seated,
the brake disc rotor may be deformed, resulting in inac-
curate grinding.

• Grind the brake disc with all wheel nuts diagonally and

equally tightened to the specified torque 100 N

⋅m (74

ft-lb). If all of the wheel nuts are not used, or the tight-
ening torque is excessive or not equal, the brake disc
rotor or drum may be deformed, resulting in judder.

5. If the run-out cannot be corrected by changing the phase of

the brake disc, replace the brake disc or grind it with the
on-the-car type brake lathe ("MAD, DL-8700PF" or
equivalent).

MASTER CYLINDER FUNCTION CHECK

M1351010200266

1. Remove the reservoir cap.
2. While watching the open reservoir from a distance of 50 cm

(20 inches), have an assistant depress the brake pedal. If
there was a stream of brake fluid rising from the reservoir,
proceed to Step 3. If there was no stream of brake fluid
rising from the reservoir, repair or replace the master
cylinder.

3. While watching the open reservoir from a distance of 50 cm

(20 inches), have the assistant release the brake pedal. If
there was a small amount of air bubbles rising through the
brake fluid, master cylinder function is normal. If there were
no bubbles rising through the brake fluid, repair or replace
the master cylinder.

AC006226 AB

M12 FLAT WASHER

M12 FLAT WASHER