Nissan Pathfinder (2012 year). Manual — part 90

REAR DISC BRAKE

BR-47

< REMOVAL AND INSTALLATION >

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Exploded View of Brake Caliper

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Rear Disc Brake Caliper

WARNING:

Clean dust on caliper and brake pad with a vacuum dust collector to minimize the hazard of airborne

particles or other materials.

CAUTION:

• While removing caliper body never depress brake pedal because piston will pop out.

• It is not necessary to remove bolts on torque member and brake hose except for disassembly or

replacement of caliper body. In this case, hang caliper body with a wire so as not to stretch the brake

hose.

• Do not damage the piston boot.

• If any shim is subject to serious corrosion, replace it with a new one.

• Always replace shim and shim cover as a set when replacing brake pads.

• Keep rotor free from grease and brake fluid.

• Burnish the brake contact surface after refinishing or replacing rotors, after replacing pads, or if a

soft pedal occurs at very low mileage. Refer to

BR-46, "Brake Burnishing"

.

Removal and Installation of Brake Caliper and Disc Rotor

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REMOVAL

1. Remove the rear wheel and tire. Refer to

WT-50, "Adjustment"

.

2. Remove master cylinder reservoir cap.

AWFIA0471GB

1.

Union bolt

2.

Brake hose

3.

Copper sealing washers

4.

Sliding pin bolt

5.

Cap

6.

Bleed valve

7.

Caliper body

8.

Sliding pin

9.

Piston seal

10. Piston

11. Piston boot

12. Torque member

13. Torque member bolt

14. Sliding pin boot

R.

Rubber grease

August 2012

2012 Pathfinder

BR-48

< REMOVAL AND INSTALLATION >

REAR DISC BRAKE

3. Remove the union bolt then disconnect the brake hose and dis-

card the copper sealing washers.

CAUTION:

Do not reuse copper sealing washers.

4. Remove the sliding pin bolts and remove the caliper body from

torque member.

5. Remove the brake pads, shims and retainers from the torque member.
6. Remove the torque member bolts and remove the torque member.
7. Remove the disc rotor. If reusing the disc rotor, apply a matching

mark as shown for installation.

CAUTION:

Put matching marks on the wheel hub assembly and disc

rotor, if reusing the disc rotor.

INSTALLATION

1. Install the disc rotor. If reusing the disc rotor, align the matching

marks as shown for installation.

CAUTION:

Align the matching marks on the wheel hub assembly and

disc rotor, if reusing the disc rotor.

2. Install torque member and tighten the torque member bolts to specification. Refer to

BR-47, "Exploded

View of Brake Caliper"

.

3. Install the brake pads, shims and retainers on the torque member. Refer to

BR-45, "Exploded View of

Brake Pad"

.

4. Install caliper body and sliding pins, then tighten the sliding pin bolts to the specified torque. Refer to

BR-

47, "Exploded View of Brake Caliper"

.

CAUTION:

When installing the caliper body to the torque member, wipe any oil off of the knuckle spindle,

washers and caliper body attachment surfaces.

LFIA0211E

SDIA2638E

SDIA2638E

August 2012

2012 Pathfinder

REAR DISC BRAKE

BR-49

< REMOVAL AND INSTALLATION >

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5. Install brake hose by aligning with the protrusion on caliper

body, then install new copper sealing washers (1) and union bolt

(A). Tighten union bolt (A) to specified torque. Refer to

BR-26,

"Hydraulic Circuit"

.

CAUTION:

Do not reuse copper sealing washers.

6. Refill with new brake fluid as necessary and bleed the brake system. Refer to

BR-20, "Bleeding Brake

System"

.

CAUTION:

• Refill with new brake fluid.

• Do not reuse drained brake fluid.

7. Install the rear wheel and tire. Refer to

WT-50, "Adjustment"

.

AWFIA0795ZZ

August 2012

2012 Pathfinder

BR-50

< UNIT DISASSEMBLY AND ASSEMBLY >

BRAKE MASTER CYLINDER

UNIT DISASSEMBLY AND ASSEMBLY

BRAKE MASTER CYLINDER

Disassembly and Assembly

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VQ40DE MODELS

VK56DE MODELS

1.

Reservoir cap

2.

Strainer

3.

Fluid level sensor

4.

Reservoir tank

5.

Grommet

6.

Restriction washer

7.

Master cylinder sub-assembly

8.

Pin

9.

O-ring

10. Brake booster

A.

PBC (Poly Butyl Cuprysil) grease
or silicone based grease

B.

Brake fluid

R.

Rubber grease

Front

AWFIA0810GB

August 2012

2012 Pathfinder

BRAKE MASTER CYLINDER

BR-51

< UNIT DISASSEMBLY AND ASSEMBLY >

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VK56DE

DISASSEMBLY

CAUTION:

• Master cylinder sub-assembly cannot be disassembled.

• Remove reservoir tank only when absolutely necessary.

• While working, cover the primary piston rod with a cloth to prevent it from being damaged.

• Never use mineral oils such as kerosene, gasoline during the cleaning and assembly process.

• Do not drop parts. If a part is dropped, do not use it.

AWFIA0864GB

1.

Reservoir cap

2.

Strainer

3.

Fluid level sensor

4.

Reservoir tank

5.

Grommet

6.

Restriction washer

7.

Master cylinder sub-assembly

8.

Pin

9.

O-ring

10. Brake booster

11. Front pressure sensor

12. Rear pressure sensor

A.

PBC (Poly Butyl Cuprysil)
grease or silicone based
grease

B.

Brake fluid

R.

Rubber grease

Front

August 2012

2012 Pathfinder

BR-52

< UNIT DISASSEMBLY AND ASSEMBLY >

BRAKE MASTER CYLINDER

1. Secure the flange of the master cylinder sub-assembly in a vise.

CAUTION:

• Use copper plates or a cloth to cover the flange before

securing it in the vise.

• When securing the master cylinder sub-assembly in a

vise, be sure not to over-tighten the vise.

2. Remove the pin and pull the reservoir tank off of the master cylinder sub-assembly.
3. Remove the grommets from the master cylinder sub-assembly body.

CAUTION:

Do not reuse grommets.

4. Remove the restriction washer from the master cylinder sub-assembly body.

CAUTION:

Do not reuse restriction washer.

5. Remove the fluid level sensor.
6. Remove the fluid pressure sensors (if equipped).

CAUTION:

Do not reuse fluid pressure sensors.

ASSEMBLY

Assembly is in the reverse order of disassembly.

CAUTION:

• Master cylinder sub-assembly cannot be disassembled.

• Remove reservoir tank only when absolutely necessary.

• While working, cover the primary piston rod with a cloth to prevent it from being damaged.

• Never use mineral oils such as kerosene, gasoline during the cleaning and assembly process.

• Do not drop parts. If a part is dropped, do not use it.

BRA0558D

August 2012

2012 Pathfinder

FRONT DISC BRAKE

BR-53

< UNIT DISASSEMBLY AND ASSEMBLY >

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FRONT DISC BRAKE

Exploded View of Brake Caliper

INFOID:0000000007356638

Front Disc Brake Caliper

WARNING:

Clean dust on caliper and brake pad with a vacuum dust collector to minimize the hazard of airborne

particles or other materials.

CAUTION:

• While removing caliper body never depress brake pedal because piston will pop out.

• It is not necessary to remove bolts on torque member and brake hose except for disassembly or

replacement of caliper body. In this case, hang caliper body with a wire so as not to stretch the brake

hose.

• Do not damage the piston boot.

• If any shim is subject to serious corrosion, replace it with a new one.

• Always replace shim and shim cover as a set when replacing brake pads.

• Keep rotor free from grease and brake fluid.

• Burnish the brake contact surface after refinishing or replacing rotors, after replacing pads, or if a

soft pedal occurs at very low mileage. Refer to

BR-41, "Brake Burnishing"

.

Disassembly and Assembly

INFOID:0000000007356639

DISASSEMBLY

AWFIA0467GB

1.

Sliding pin bolt

2.

Caliper body

3.

Piston seal

4.

Piston

5.

Piston boot

6.

Sliding pin

7.

Sliding pin boot

8.

Torque member bolt

9.

Torque member

10. Bleed valve

11. Cap

12. Copper sealing washers

13. Union bolt

14. Front brake hose

R.

Rubber grease

August 2012

2012 Pathfinder

BR-54

< UNIT DISASSEMBLY AND ASSEMBLY >

FRONT DISC BRAKE

1. Remove the caliper body from the torque member. Refer to

BR-42, "Removal and Installation of Brake

Caliper and Disc Rotor"

.

2. Remove the upper sliding pin, lower sliding pin, and sliding pin boots from the torque member.
3. Place a wooden block as shown, and then blow air from the

union bolt hole to remove the pistons and piston boots.

WARNING:

Do not get your fingers caught between the pistons and

wooden block.

4. Remove the piston boots from the pistons.

CAUTION:

Do not reuse piston boot.

5. Remove piston seals from cylinder body, using a suitable tool.

CAUTION:

• Be careful not to damage cylinder body inner wall.

• Do not reuse piston seal.

6. Remove the bleed valve and cap.

CALIPER INSPECTION

Cylinder Body

• Check the inside surface of the cylinder body for score, rust, wear, damage or foreign materials. If any of the

above conditions are observed, replace the cylinder body.

• Minor damage from rust or foreign materials may be eliminated by polishing surface with a fine emery paper.

Replace cylinder body if necessary.

CAUTION:

• Use new brake fluid for cleaning. Do not use mineral oils such as gasoline or kerosene.

Torque Member

Check the torque member for wear, cracks, and damage. If damage or deformation is present, replace the

torque member.

Piston

Check the pistons for score, rust, wear, damage or presence of foreign materials. Replace if any of these con-

ditions are observed.

CAUTION:

Piston sliding surface is plated, do not polish with emery paper even if rust or foreign materials are

stuck to sliding surface.

Sliding Pins, and Sliding Pin Boots

Check the sliding pins and sliding pin boots for wear, damage, and cracks. If damage or deformation is

present, replace the affected part.

ASSEMBLY

CAUTION:

Use NISSAN Rubber Grease when assembling.

1. Install the bleed valve and cap.

BRB0032D

SFIA0141E

August 2012

2012 Pathfinder