Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 22

PM-26

Brake Fluid

PERIODIC MAINTENANCE SERVICES

17.Brake Fluid

A: INSPECTION

1) Check that the amount of brake fluid is between

the lines of “MIN” and “MAX”. If out of the specified

range, refill or drain the fluid. If the fluid level is

close to “MIN”, check the brake pad for wear and

refill the fluid.

2) Check the fluid for discoloration. If the fluid is ex-

tremely discolored, replace with the new fluid.

B: REPLACEMENT

CAUTION:

• Do not let brake fluid come into contact with

the painted surface of the vehicle body. Wash

away with water immediately and wipe off if it is

spilled by accident.

• Avoid mixing brake fluid of different brands

to prevent fluid performance from degrading.

• Be careful not to allow dirt or dust to enter the

reservoir tank.

• If the brake fluid is spilt over exhaust pipe,

wipe it off with cloth to avoid emitting smoke or

causing a fire.
NOTE:

• During the operation, keep the reservoir tank

filled with brake fluid to prevent entry of air.

• Operate the brake pedal slowly.

• For convenience and safety, perform the work

with 2 people.

• The required amount of brake fluid is approxi-

mately 500 mL (16.9 US fl oz, 17.6 Imp fl oz) for the

entire brake system.

1) Either jack-up the vehicle and place a rigid rack

under it, or have the vehicle lifted.

2) Remove all the wheels.

3) Drain brake fluid from the reservoir tank.

4) Refill the reservoir tank with recommended

brake fluid.
Recommended brake fluid:

Refer to “RM” section. <Ref. to RM-4, FLUID,

RECOMMENDED MATERIALS, Recommend-

ed Materials.>

Perform the same procedure as for bleeding the

brake line, until new brake fluid comes out from vi-

nyl tube. <Ref. to BR-41, PROCEDURE, Air Bleed-

ing.>
NOTE:

Perform brake fluid replacement starting in the or-

der from the farthest wheel cylinder from the mas-

ter cylinder.

5) Install one end of a vinyl tube onto the air bleeder

and insert the other end of the tube into a container

to collect the brake fluid.
NOTE:

For calipers with two air bleeder screws, bleed air

from the inner side first and then the outer side.

6) Instruct your co-worker to depress the brake

pedal slowly two or three times and then hold it de-

pressed.

7) Loosen the bleeder screw approximately 1/4

turn until a small amount of brake fluid drains into

the container, and then quickly tighten the screw.

8) Repeat steps 6) and 7) until there are no air bub-

bles in drained brake fluid and new fluid flows

through vinyl tube.
NOTE:

Add brake fluid as necessary while performing the

air bleed operation, in order to prevent the tank

from running short of brake fluid.

9) After completing the bleeding operation, hold the

brake pedal depressed and tighten the screw and

install bleeder cap.
Tightening torque:

Brembo type: 20 N·m (2.0 kgf-m, 14.8 ft-lb)

Except for brembo type: 8 N·m (0.8 kgf-m, 5.9

ft-lb)

10) Bleed air from each wheel cylinder by following

steps from 5) to 9).

11) Depress the brake pedal with a force of approx.

294 N (30 kgf, 66 lbf) and hold it there for approx.

20 seconds. At this time check the pedal to see if it

makes any unusual movement. Visually inspect the

bleeder screws and brake pipe joints to confirm

there is no fluid leakage.

(1) Inner side air bleeder screw
(2) Outer side air bleeder screw

BR-00376

(2)

(1)

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PM-27

Disc Brake Pad and Disc

PERIODIC MAINTENANCE SERVICES

18.Disc Brake Pad and Disc

A: INSPECTION

1. DISC BRAKE PAD AND DISC

1) Jack-up the vehicle and support it with rigid

racks. Remove the wheels.

2) Visually check the pad thickness through inspec-

tion hole of disc brake assembly. Replace the pad if

necessary.
NOTE:

When replacing a pad, always replace the pads for

both the left and right wheels at the same time. Also

replace the pad clips if they are twisted or worn.

• Front (back metal not included)

Brembo type

Except for brembo type

• Rear (back metal not included)

Brembo type

Except for brembo type

3) Check the disc rotor, and correct or replace if it is

damaged or worn.

• Front

Brembo type

Except for brembo type

• Rear

Brembo type

Except for brembo type

4) Remove the caliper body. <Ref. to BR-19, Front

Disc Brake Assembly.> <Ref. to BR-29, Rear Disc

Brake Assembly.>

5) Tighten the wheel nuts to secure disc rotor.

6) Set a dial gauge at a point of 10 mm (0.39 in) or

less from outer periphery of the rotor, and then

measure the disc rotor runout.
Disc rotor runout limit:

Brembo type

Front: 0.075 mm (0.0030 in)

Rear: 0.070 mm (0.0028 in)

Except for brembo type

Front: 0.050 mm (0.0020 in)

Rear: 0.050 mm (0.0020 in)

(A) Pad thickness

Pad thickness

mm (in)

Standard

8.9 (0.350)

Wear limit

1.2 (0.047)

Pad thickness

mm (in)

Standard

11 (0.43)

Wear limit

1.5 (0.059)

Pad thickness

mm (in)

Standard

9.0 (0.354)

Wear limit

1.2 (0.047)

Pad thickness

mm (in)

Standard

9.0 (0.354)

Wear limit

1.5 (0.059)

A

BR-00296

Disc rotor thickness

mm (in)

Standard

30 (1.18)

Wear limit

28 (1.10)

Disc rotor thickness

mm (in)

Standard

24 (0.94)

Wear limit

22 (0.87)

Disc rotor thickness

mm (in)

Standard

20 (0.79)

Wear limit

18 (0.71)

Disc rotor thickness

mm (in)

Standard

10 (0.39)

Wear limit

8.5 (0.33)

PM-00051

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PM-28

Parking Brake

PERIODIC MAINTENANCE SERVICES

19.Parking Brake

A: INSPECTION

1) Measure the inner diameter of the brake disc ro-

tor. If scoring or worn is found on the disk, replace

the brake disc rotor.
Disc rotor inner diameter:

Standard

190 mm (7.48 in)

Service limit

191 mm (7.52 in)

2) Measure the lining thickness. If it exceeds the

limit, replace the brake shoe.
Lining thickness:

Standard

2.8 mm (0.11 in)

Service limit

1.5 mm (0.059 in)

NOTE:

Replace the right and left primary and secondary

brake shoes as a set.

B: ADJUSTMENT

For rear disc brake, adjust the parking brake after

bleeding air.

1) Return the parking brake pedal fully.

2) Loosen the adjusting nut, and make the cable

free.

3) Remove the adjusting hole cover from the disc

rotor.

4) Using a flat tip screwdriver, turn the adjusting

screw in the direction of the arrow (shoe extension

direction) as shown in the figure until it is locked

slightly (until the disc no longer rotates with both

hands).

5) Loosen the adjusting screw by 5 notches to op-

posite direction of arrow.
CAUTION:

• Check there is no brake drag.

• If the amount that the adjusting screw is

turned back is little, securely loosen it by 5

notches to avoid dragging.

6) Install the adjusting hole cover to the disc rotor.

7) Adjust the parking brake lever stroke. <Ref. to

PB-8, LEVER STROKE, ADJUSTMENT, Parking

Brake Assembly (Rear Disc Brake).>

(1) Adjusting screw
(2) Flat tip screwdriver
(3) Disc rotor

(1)

(3)

(2)

PM-00537

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PM-29

Suspension

PERIODIC MAINTENANCE SERVICES

20.Suspension

A: INSPECTION

1. SUSPENSION BALL JOINT

1) Jack up the vehicle until front tires are off

ground.

2) Grasp the bottom of tire and move it in and out in

axial direction. If relative movement (B) is observed

between the brake disc cover (A) and end of front

arm (D), ball joint (C) may be excessively worn.

3) Grasp the end of front arm and move it up and

down. Relative movement (A) between the housing

(D) and front arm (C) boss indicates ball joint (B)

may be excessively worn.

4) If the relative movement is observed in the pre-

ceding two steps, remove and inspect the ball joint.

If the free play exceeds standard value, replace the

ball joint. <Ref. to FS-18, Front Ball Joint.>

5) Damage of dust cover

Visually inspect the ball joint dust cover. If it is dam-

aged, remove the front arm. <Ref. to FS-20, Front

Arm.> Measure the play of the ball joint. <Ref. to

FS-18, Front Ball Joint.>

(1) If the free play exceeds standard value, re-

place the ball joint.

(2) If the dust cover is damaged, replace with a

new ball joint.

NOTE:

When the front arm ball joint has been removed or

replaced, check the toe of front wheel. If the front

wheel toe is outside the specified range, <Ref. to

FS-8, Wheel Alignment.> adjust toe-in.

2. FRONT, REAR SUSPENSION BUSHING

Apply pressure with tire lever or similar tool to in-

spect the bushing for fatigue or other damage. If

defective, replace the bushing.

(D)

(C)

(A)

(B)

PM-00258

(D)

(C)

(B)

(A)

PM-00259

(A) Dust cover

(A)

PM-00059

PM-00405

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