Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 558

BR-17

Front Disc Rotor

BRAKE

3. Front Disc Rotor

A: REMOVAL

1) Lift up the vehicle, and then remove the front

wheels.

2) Remove the caliper body assembly from hous-

ing, and suspend it from the strut using a wire.
CAUTION:

Be careful not to stretch the brake hose.

• Brembo type

• Except for brembo type

3) Remove the disc rotor.
NOTE:

If it is difficult to remove the disc rotor from the hub,

drive an 8 mm bolt into the threaded section (B) of

the rotor, then remove the rotor.

4) Remove mud and foreign matter from the caliper

body assembly.

B: INSTALLATION

1) Install the disc rotor.

2) Install the caliper body assembly to the housing.
Tightening torque:

Brembo type

155 N·m (15.81 kgf-m, 114.3 ft-lb)

Except for brembo type

80 N·m (8.16 kgf-m, 59 ft-lb)

3) Install the front wheels.

C: INSPECTION

1) Check the front wheel bearing play and axle hub

runout before the inspection of disc rotor runout

limit. <Ref. to DS-17, INSPECTION, Front Axle.>

2) Secure the disc rotor by tightening the five wheel

nuts.

3) Set a dial gauge 10 mm (0.39 in) inward from the

disc rotor outer circumference. Rotate the disc rotor

to check runout. If the disc rotor runout exceeds the

limit, resurface the disc rotor. After grinding, check

the thickness of the disc rotor according to the pro-

cedure in step 4).

Disc rotor runout limit:

Brembo type

0.075 mm (0.0030 in)

Except for brembo type

0.050 mm (0.0020 in)

BR-00297

BR-00017

BR-00018

B

A

BR-00019

BR-18

Front Disc Rotor

BRAKE

4) Set a micrometer 10 mm (0.39 in) inward from

the disc rotor outer perimeter, and then measure

the disc rotor thickness. If the thickness A of the

disc rotor exceeds the service limit, replace with a

new disc rotor.

Disc rotor thickness A

mm (in)

Standard

Limit

Disc rotor

diameter

Brembo type

30 (1.18) 28 (1.10) 326 (12.83)

Except for brembo

type

24 (0.94) 22 (0.87) 294 (11.57)

BR-00018

B

A

BR-19

Front Disc Brake Assembly

BRAKE

4. Front Disc Brake Assembly

A: REMOVAL

1. BREMBO TYPE

CAUTION:

Do not allow brake fluid to come in contact with

the painted surface of the vehicle body. If it

does, wash off with water immediately and wipe

away completely.

1) Lift up the vehicle, and then remove the front

wheels.

2) Remove the union bolt (1) and brake hose from

the caliper body.

3) Remove the mounting bolts (2) from the hous-

ing.

4) Remove mud and foreign matter from the caliper

body assembly.

2. EXCEPT FOR BREMBO TYPE

CAUTION:

Do not allow brake fluid to come in contact with

the painted surface of the vehicle body. If it

does, wash off with water and wipe away com-

pletely.

1) Lift up the vehicle, and then remove the front

wheels.

2) Remove the union bolt, and disconnect the

brake hose from the caliper body.

3) Remove the bolts which secure the caliper body.

4) Raise the caliper body, and then move it toward

vehicle center to separate it from the support.

5) Remove the brake pad, and then remove the

support from the housing.
NOTE:

Remove the support only when replacing the rotor

or support. It is not necessary to remove it when

servicing the caliper body.

6) Remove mud and foreign matter from the caliper

body and the support.

B: INSTALLATION

1. BREMBO TYPE

1) Install the caliper body assembly to the housing.
Tightening torque:

155 N·m (15.81 kgf-m, 114.3 ft-lb)

2) Apply a thin coat of Molykote M7439 or grease

contained in the pad kit to the pad side.

(1)

(2)

BR-00299

BR-00021

BR-00022

BR-00023

BR-00782

BR-20

Front Disc Brake Assembly

BRAKE

3) Apply a thin coat of Molykote AS880N (Part No.

K0777YA010) or grease contained in the pad kit to

the pad and pad shim.

4) Install the pads to the caliper body.

5) Install the cross spring.

6) Install the pad pins.

7) Install the clips.

8) Connect the brake hose using a new brake hose

gasket.
Tightening torque:

18 N·m (1.84 kgf-m, 13.3 ft-lb)

9) Bleed air from the brake system. <Ref. to BR-41,

PROCEDURE, Air Bleeding.>

2. EXCEPT FOR BREMBO TYPE

1) Apply a thin coat of Molykote M7439 or grease

contained in the pad kit to the support.

2) Install the support to the housing.
Tightening torque:

80 N·m (8.16 kgf-m, 59 ft-lb)

3) Apply a thin coat of Molykote M7439 or grease

contained in the pad kit to the pad clip.

4) Apply a thin coat of Molykote AS880N (Part No.

K0777YA010) or grease contained in the pad kit to

both surfaces of the pad and inner shim.

5) Install the pad to support.
CAUTION:

• Be sure to install so that the pad return

spring faces the input side of the direction of

brake rotor rotation, as shown in the figure.

• Correctly install the pad return spring to the

supporting surface of the pad clip as shown in

the figure.

• If the pad return spring is deformed or dam-

aged, replace the brake pad.

BR-00783

BR-00597

(1) Pad return spring
(2) Supporting surface of pad clip
(3) Direction of brake rotor rotation

BR-00596

BR-00837

BR-00885

(3)

(1)

(2)