Infiniti Q45. Manual - part 257

 

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Infiniti Q45. Manual - part 257

 

 

REAR DISC BRAKE

BR-29

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REAR DISC BRAKE

PFP:44000

On-Vehicle Inspection

NFS000BV

PAD WEAR INSPECTION

Check pad thickness from check hole on cylinder body.

Components

NFS000BW

Standard thickness

: 9.8 mm (0.386 in)

Replace limit thickness

: 2.0 mm (0.079 in)

BRA0010D

PFIA0690E

1.

Union bolt

2.

Copper washer

3.

Brake hose

4.

Cap

5.

Bleed valve

6.

Sliding pin bolt

7.

Cylinder body

8.

Piston seal

9.

Piston

10. Piston boot

11. Retaining ring

12. Inner shim cover

13. Inner shim

14. Inner pad

15. Pad retainer

16. Outer pad

17. Outer shim

18. Outer shim cover

19. Sliding pin

20. Sliding pin boot

21. Torque member mounting bolt

22. Washer

23. Torque member

24. Bushing

Refer to 

GI-9, "Components"

 and the followings for the symbols in the figure.

1: Apply rubber grease.

2: Apply PBC (Poly Butyl Cuprysil) grease or silicone-based grease.

BR-30

REAR DISC BRAKE

WARNING:

Clean dust on caliper and brake pad with vacuum dust collector to minimize the hazard of airborne
particles or other materials. Do not blow with compressed air.

CAUTION:

While removing cylinder body, do not depress brake pedal because piston will pop out.

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

Do not damage piston boot.

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

Keep rotor clean, off brake fluid.

Removal and Installation of Brake Pad

NFS000BX

REMOVAL

WARNING:

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

CAUTION:

While cylinder body is open, do not depress brake pedal, otherwise 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 torque member mounting bolt except for disassembly or replace-
ment of caliper assembly. In this case, suspend cylinder body with a wire so as not to stretch
brake hose.

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

Burnish the rotor surfaces contacting with pads or linings 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-34,

"Brake Burnishing Procedure"

 .

1.

Remove tires from vehicle with a power tool.

2.

Remove lower sliding pin bolt.

3.

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

CAUTION:

Do not damage piston boot.

Keep rotor clean, off brake fluid.

INSTALLATION

1.

Apply PBC (Poly Butyl Cuprysil) or equivalent to both sides of inner shim and outer shim, and install inner
shim and shim cover to inner pad, and outer shim and outer shim cover to pad.

2.

Install cylinder body to torque member.

CAUTION:

When replacing pads with new ones, press in piston until pads can be installed. In this case, care-
fully monitor brake fluid level in reservoir tank because brake fluid will return to master cylinder
reservoir tank.

3.

Insert lower sliding pin bolt to tighten to the specified torque. Refer to 

BR-29, "Components"

 .

4.

Fix disc rotor with a wheel nut. Depress brake pedal a few times until it gets a responsive touch. 

3: Apply polyglycol ether based lubricant.

: Apply brake fluid.

SBR090C

REAR DISC BRAKE

BR-31

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5.

Check brake for drag.

6.

Install tires to vehicle.

Removal and Installation of Brake Caliper Assembly

NFS000BY

REMOVAL

1.

Remove tires from vehicle with a power tool.

2.

Drain brake fluid gradually from bleed valve while depressing
brake pedal. Refer to 

BR-9, "Drain and Refill"

 .

3.

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

4.

Remove torque member mounting bolts from torque member,
and remove caliper assembly from vehicle with a power tool.

5.

Remove disc rotor.

CAUTION:

Put matching mark on both disc rotor and wheel hub when
removing disc rotor.

INSTALLATION

1.

Install disc rotor.

CAUTION:

Align the marks of disc rotor and wheel hub, which were marked at the time of removal when reus-
ing disc rotor.

2.

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

BR-29, "Components"

 .

CAUTION:

Before installing caliper assembly to vehicle, wipe oil and grease on washer seats on axle assem-
bly and mounting surface of caliper assembly.

3.

Install brake hose to caliper assembly and tighten union bolts to the specified torque. Refer to 

BR-10,

"Hydraulic Circuit"

 .

CAUTION:

Do not reuse copper washer for union bolts.

Install a projection of brake hose metal fitting by aligning with protrusions on cylinder body.

4.

After installing caliper assembly, refill with new brake fluid and bleed air. Refer to 

BR-9, "BRAKE FLUID"

 .

5.

Install tires to vehicle.

Disassembly and Assembly of Brake Caliper Assembly

NFS000BZ

DISASSEMBLY

1.

Remove caliper assembly from vehicle. Refer to 

BR-31, "Removal and Installation of Brake Caliper

Assembly"

 .

2.

Remove sliding pins. Then remove pads, shims, and shim covers from caliper assembly, and remove pad
retainers from cylinder body.

3.

Remove sliding pin boot from torque member.

4.

Using a flat-bladed screwdriver as shown in figure, remove
retaining ring from cylinder body.

SFIA0143E

SBR028A

BR-32

REAR DISC BRAKE

5.

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

6.

Using a flat-bladed screwdriver, remove piston seals from cylin-
der body.

CAUTION:

Be careful not to damage the inner wall of cylinder.

INSPECTION AFTER DISASSEMBLY
Cylinder Body

CAUTION:

Use new brake fluid to clean. Do not use mineral oils such as gasoline or kerosene.

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

Minor flaws caused by corrosion or foreign material can be removed by polishing a surface of the inner
wall with a fine sandpaper. Replace cylinder body, if necessary.

Torque Member

Check for wear, cracks, and damage. If a malfunction is detected, replace applicable part.

Piston

CAUTION:

The piston sliding surface is plated. Do not polish with sandpaper.
Check piston surface for corrosion, wear, and damage. If a malfunction is detected, replace applicable part.

Sliding Pin, Sliding Pin Bolt and Sliding Pin Boot

Check sliding pins and sliding pin boots for wear, damage, and cracks. If a malfunction is detected, replace
applicable part.

ASSEMBLY

CAUTION:

When assembling, use only rubber lubricant specified below.

1.

Apply polyglycol ether based lubricant to piston seal, and install
them to the cylinder body.

BRD0041D

SFIA0999E

SFIA2278E

 

 

 

 

 

 

 

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