Infiniti QX56 (Z62). Manual - part 128

BR-44

< REMOVAL AND INSTALLATION >

REAR DISC BRAKE

CAUTION:

• Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it

off immediately and wash with water if it gets on a painted surface.

• Never depress the brake pedal. Brake fluid may splash while removing the brake hose.
• If the brake fluid or grease adheres to the brake caliper assembly and disc rotor, quickly wipe it off.
1.

Remove tires with power tool.

2.

Fix the disc rotor using wheel nuts.

3.

Drain brake fluid. Refer to 

BR-10, "Draining"

.

4.

Separate brake hose from brake caliper assembly. Refer to 

BR-26, "REAR : Removal and Installation"

.

5.

Remove torque member mounting bolts, and remove brake caliper assembly.

CAUTION:

Never drop brake pad and caliper assembly.

6.

Remove disc rotor. Refer to 

RAX-7, "Removal and Installation"

.

INSTALLATION

WARNING:

Clean any dust from the brake caliper assembly and brake pads with a vacuum dust collector. Never
blow with compressed air.

CAUTION:

• Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it

off immediately and wash with water if it gets on a painted surface.

• Never depress the brake pedal. Brake fluid may splash while removing the brake hose.
• If the brake fluid or grease adheres to the brake caliper assembly and disc rotor, quickly wipe it off.

1.

Install disc rotor. Refer to 

RAX-7, "Removal and Installation"

.

2.

Install the brake caliper assembly to the axle housing and tighten the torque member mounting bolts to the
specified torque.

CAUTION:

Never spill or splash any grease and moisture on the brake caliper assembly mounting face,
threads, mounting bolts. Wipe out any grease and moisture.

3.

Install brake hose to brake caliper assembly. Refer to 

BR-26, "REAR : Removal and Installation"

.

4.

Perform the air bleeding. Refer to 

BR-11, "Bleeding Brake System"

.

5.

Check a drag of rear disc brake. If any drag is found, refer to 

BR-45, "BRAKE CALIPER ASSEMBLY :

Inspection"

.

6.

Install tires with power tool. Refer to 

WT-64, "Exploded View"

.

BRAKE CALIPER ASSEMBLY : Disassembly and Assembly

INFOID:0000000006222500

DISASSEMBLY

NOTE:
Never remove the torque member, brake pads and pad retainers when disassembling and assembling the cyl-
inder body.

1.

Remove the sliding pin bolt, and remove the cylinder body from the torque member.

CAUTION:

Fix the brake pad at suitable tape so that the brake pad will not drop.

2.

Remove sliding pin boots from torque member.

3.

Remove bushing from sliding pin bolt.

4.

Place a wooden block as shown in the figure, and blow air from
brake hose mounting hole to remove piston and piston boot.

CAUTION:

Never get fingers caught in the piston.

MAA0272D

REAR DISC BRAKE

BR-45

< REMOVAL AND INSTALLATION >

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5.

Remove piston seal from cylinder body using suitable tool.

CAUTION:

Be careful not to damage a cylinder inner wall.

6.

Remove bleeder valve and cap.

7.

Perform inspection after disassembly. Refer to 

BR-45, "BRAKE

CALIPER ASSEMBLY : Inspection"

.

ASSEMBLY

1.

Install bleeder valve and cap.

2.

Apply rubber grease to piston seal (1), and install them to cylin-
der body.

CAUTION:

Never reuse piston seal.

3.

Apply rubber grease to piston boot (1). Cover the piston (2) end
with piston boot, and then install cylinder side lip on piston boot
securely into a groove on cylinder body.

CAUTION:

Never reuse piston boot.

4.

Apply new brake fluid to piston (1). Push piston into cylinder
body by hand and push piston boot (2) piston-side lip into the
piston groove.

CAUTION:

Press the piston evenly and vary the pressing point to pre-
vent cylinder inner wall from being rubbed.

5.

Apply rubber grease to bushing, and install bushing to sliding pin
bolt.

6.

Apply rubber grease to sliding pin boots, and install sliding pin
boots to torque member.

7.

Apply rubber grease to sliding pin, and install the cylinder body.

8.

Install sliding pin bolts and tighten it to the specified torque.Refer to 

BR-42, "BRAKE CALIPER ASSEM-

BLY : Exploded View"

.

BRAKE CALIPER ASSEMBLY : Inspection

INFOID:0000000006222501

INSPECTION AFTER DISASSEMBLY

Check the following items and replace if necessary.

Cylinder Body

Check the cylinder inner wall for rust, wear, cracks or damage.

JPFIA0738ZZ

JPFIA0039ZZ

JPFIA0739ZZ

JPFIA0034ZZ

BR-46

< REMOVAL AND INSTALLATION >

REAR DISC BRAKE

CAUTION:

Always clean with new brake fluid. Never clean with mineral oil such as gasoline and light oil.

Torque Member

Check the torque member for rust, wear, cracks or damage.

Piston

Check the surface of the piston for rust, wear, cracks or damage.

CAUTION:

A piston sliding surface is plated. Never polish with sandpaper.

Sliding Pin, Sliding Pin Boot and Bushing

Check the sliding pins, sliding pin boots and bushing for rust, wear, cracks or damage.

INSPECTION AFTER INSTALLATION

1.

Check a drag of rear disc brake. If any drag is found, follow the procedure described below.

2.

Remove brake pads. Refer to 

BR-41, "BRAKE PAD : Removal and Installation"

.

3.

Press the piston. Refer to 

BR-41, "BRAKE PAD : Removal and Installation"

.

4.

Install brake pads. Refer to 

BR-41, "BRAKE PAD : Removal and Installation"

.

5.

Depress the brake pedal several times.

6.

Check a drag of rear disc brake again. If any drag is found, disassemble the caliper. Refer to 

BR-44,

"BRAKE CALIPER ASSEMBLY : Disassembly and Assembly"

.

7.

Burnish contact surfaces brake pads and disc rotor after refinishing or replacing disc rotor, or if a soft
pedal occurs at very low mileage. Refer to 

BR-18, "DISC ROTOR : Inspection and Adjustment"

.

SERVICE DATA AND SPECIFICATIONS (SDS)

BR-47

< SERVICE DATA AND SPECIFICATIONS (SDS) 

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SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS)

General Specification

INFOID:0000000006222502

Unit: mm (in)

Brake Pedal

INFOID:0000000006222503

Unit: mm (in)

Brake Booster

INFOID:0000000006222504

Unit: mm (in)

Front Disc Brake

INFOID:0000000006222505

Unit: mm (in)

Rear Disc Brake

INFOID:0000000006222506

Unit: mm (in)

Front brake

Cylinder bore diameter

50.8 (2.000) 

×

 2

Pad length 

×

 width 

×

 thickness

151.6 (5.97) 

×

 56.5 (2.224) 

×

 12.0 (0.472)

Rotor outer diameter 

×

 thickness

350 (13.78) 

×

 30.0 (1.181)

Rear brake

Cylinder bore diameter

48.1 (10894)

Pad length 

×

 width 

×

 thickness

110.0 (4.43) 

×

 41.0 (1.614) 

×

 9.0 (0.354)

Rotor outer diameter 

×

 thickness

350 (13.78) 

×

 20.0 (0.787)

Control valve

Valve type

Electric brake force distribution

Recommended brake fluid

Refer to 

MA-10, "Fluids and Lubricants"

.

Item

Standard

Brake pedal height

168.5 (6.63) – 178.5 (7.03)

Depressed brake pedal height
[Depressing 490 N (50 kg, 110 lb) while turning the engine ON]

100 (3.94) or more

Clearance between stop lamp switch and brake switch threaded end and the 
brake pedal bracket

0.2 (0.008) – 1.96 (0.0772)

Brake pedal play

3 (0.12) – 11 (0.43)

Item

Standard

Input rod length

202.2 (7.96)

Item

Limit

Brake pad

Wear thickness

1.5 (0.059)

Disc rotor

Wear thickness

28.5 (1.122)

Thickness variation (measured at 8 positions)

0.015 (0.0006)

Runout (with it attached to the vehicle)

0.053 (0.0021)

Item

Limit

Brake pad

Wear thickness

2.0 (0.079)

Disc rotor

Wear thickness

18.0 (0.709)

Thickness variation (measured at 8 positions)

0.015 (0.0006)

Runout (with it attached to the vehicle)

0.05 (0.0020)