Infiniti M45 (Y34). Manual - part 261

FRONT DISC BRAKE

BR-23

C

D

E

G

H

I

J

K

L

M

A

B

BR

FRONT DISC BRAKE

PFP:41000

On-Board Inspection 

AFS000KA

PAD WEAR INSPECTION

●

Remove the wheel with the vehicle lifted to check the pad thick-
ness from the check hole on the cylinder body. If necessary, use
a scale to check.

Components (CLZ31VA Type) 

AFS000K9

CAUTION:

●

Clean dust on the caliper and brake pad with a vacuum dust collector. Do not blow with com-
pressed air.

●

While removing the cylinder body, never depress the brake pedal because the piston will pop out.

Standard thickness 

: 10.0 mm (0.394 in)

Repair limit thickness 

: 2.0 mm (0.079 in)

MAA0439D

1.

Sliding pin 

2.

Pin boot

3.

Washer

4.

Torque member

5.

Inner shim cover

6.

Inner shim

7.

Inner pad

8.

Pad retainer

9.

Outer pad

10. Outer shim

11. Outer shim cover

12. Union bolt

13. Copper washer

14. Bleed valve

15. Cylinder body

16. Piston seal

17. Piston

18. Piston boot

19. Sliding pin bolt

20. Cap

SFIA2166E

BR-24

FRONT DISC BRAKE

●

It is not necessary to remove the mounting bolts on the torque member and brake hose except for
disassembly or replacement of the caliper assembly. In this case, hang the cylinder body with a
wire so that the brake hose is not under tension.

●

Do not damage the piston boot.

●

Always replace the shims and shim covers as a set when replacing the brake pads.

●

Keep the rotor clean away from brake fluid.

Pad Replacement

AFS000KB

REMOVAL

WARNING:

Clean brake pads with a vacuum dust collector to minimize the hazard of airborne particles or other
materials.

CAUTION:

●

When cylinder body is open, do not depress brake pedal because the piston will pop out. 

●

Be careful not to damage piston boot or get oil on rotor. Always replace shims when replacing
pads.

●

If shims are rusted or show peeling of rubber coat, replace them with new shims.

●

It is not necessary to remove connecting bolt except for disassembly or replacement of caliper
assembly. In this case, suspend cylinder body with wire so as not to stretch brake hose.

●

Carefully monitor brake fluid level because brake fluid will return to reservoir when pushing back
piston.

●

Burnish the brake contact surfaces after refinishing or replacing drums or rotors, after replacing
pads or linings, or if a soft pedal occurs at very low mileage. Refer to 

BR-28, "Brake Burnishing

Procedure"

 .

1.

Remove tire from vehicle.

2.

Remove master cylinder reservoir cap.

3.

Remove the lower sliding pin bolt.

4.

Hang the cylinder body with a wire, and remove the pads, pad
retainers, shims and shim cover from the torque member.

SBR433D

SBR932C

FRONT DISC BRAKE

BR-25

C

D

E

G

H

I

J

K

L

M

A

B

BR

CAUTION:

●

When removing the pad retainer from the torque member,
lift the pad retainer in the direction shown by the arrow
(shown in the figure) so as not to deform it.

●

Do not damage the piston boot.

●

Keep the rotor clean away from brake fluid.

INSTALLATION

1.

Apply grease to the back of the pad and both sides of the shim, install the inner shim cover and inner shim
to the inner pad, and the outer shim and outer shim cover to the outer pad.

2.

Apply grease to the pad contact surface on the pad retainer, and
install the pad retainers and pads to the torque member.

CAUTION:

The CLZ31VA inner pad and outer pad have the pad-return
mechanism on the upper side of the pad retainer. When
installing the CLZ31VA pad to the torque member, be sure
to install the pad return lever to the pad wear sensor
securely.

3.

Install the cylinder body to the torque member.

CAUTION:

When replacing the pads with new ones, press in the piston
until the pads can be installed. In this case, carefully moni-
tor the brake fluid level in the reservoir tank because the brake fluid will return to the reservoir
tank of the master cylinder.

4.

Install the lower sliding pin bolt, and tighten it to the specified
torque.

5.

Check the brake for drag.

6.

Attach the tire to the vehicle.

Removal and Installation of Caliper Assembly

AFS000KC

REMOVAL

1.

Remove tire from vehicle.

2.

Connect a vinyl tube to the bleed valve.

3.

Drain brake fluid gradually from the bleed valve while depress-
ing the brake pedal.

4.

Remove the union bolts, and then remove the brake hose from
the caliper assembly.

5.

Remove the mounting bolts from the torque member, and
remove the caliper assembly from the vehicle.

6.

Remove the disc rotor.

SBR556E

SBR557E

SBR433D

SFIA0140E

BR-26

FRONT DISC BRAKE

INSTALLATION

1.

Install the disc rotor.

2.

Install the caliper assembly to the vehicle, and tighten the mounting bolts to the specified torque.

CAUTION:

Before installing the caliper assembly to the vehicle, wipe oil and grease on the washer seats on
the knuckle spindle and mounting surface of the torque member.

3.

Install the brake hose by aligning with the protrusions on the caliper assembly, and tighten the union bolts
to the specified torque.

CAUTION:

●

Do not reuse the copper washer for union bolts.

●

Assemble the brake hose securely to the protrusions on caliper assembly.

4.

Refill with new brake fluid and bleed air. Refer to 

BR-9, "Bleeding Brake System"

 .

Disassembly and Assembly of Caliper Assembly

AFS000KD

DISASSEMBLY

1.

Remove the sliding pin bolts from the cylinder body, and remove
the pads, shims, shim covers and pad retainers from the torque
member.

CAUTION:

When removing the pad retainer from the torque member,
lift the pad retainer in the direction shown by the arrow
(shown in the figure) so as not to deform it.

2.

Remove the sliding pins and sliding pin boots from the torque
member.

3.

Place a wooden block as shown in the figure, and blow air from
the union bolt mounting hole to remove the pistons and piston
boots.

CAUTION:

Do not get fingers caught in the piston.

4.

Using a flat-bladed screwdriver, remove the piston seals from
the cylinder body.

CAUTION:

Be careful not to damage the inner wall of the cylinder.

CALIPER INSPECTION
Cylinder Body

CAUTION:

Use new brake fluid to clean. Never use mineral oils such as gasoline or kerosene.

●

Check the inner wall of the cylinder for corrosion, wear, and damage. If a malfunction is detected, replace
the cylinder body.

SBR556E

BRB0032D

SFIA0141E