Nissan Pathfinder (2012 year). Manual - part 88

BRAKE TUBE AND HOSE

BR-31

< REMOVAL AND INSTALLATION >

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1. Check brake pipes and hoses, and connections for fluid leaks, damage, twist, deformation, contact with

other parts, and loose connections. Replace any parts as necessary. Refer to 

BR-26, "Hydraulic Circuit"

.

2. While depressing brake pedal under a force of 785 N (80 kg-f, 177 lb-f) with engine running for approxi-

mately 5 seconds, check each part for fluid leaks.

August 2012

2012 Pathfinder

BR-32

< REMOVAL AND INSTALLATION >

BRAKE MASTER CYLINDER

BRAKE MASTER CYLINDER

Removal and Installation

INFOID:0000000007356624

VQ40DE

REMOVAL

CAUTION:

Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is

splashed on painted areas, wash it away with water immediately. 

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Remove master cylinder reservoir cap.
2. Disconnect the harness connector for the fluid level sensor.
3. Disconnect the brake pipes from the master cylinder assembly, using suitable tool.

AWFIA0810GB

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

August 2012

2012 Pathfinder

BRAKE MASTER CYLINDER

BR-33

< REMOVAL AND INSTALLATION >

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4. Remove the master cylinder assembly nuts and discard.

CAUTION:

Discard the nuts, do not reuse.

5. Remove the master cylinder assembly and O-ring.

CAUTION:

Do not reuse O-ring.

INSTALLATION

Installation is in the reverse order of removal.

• Apply silicone grease to the brake booster at position (A) as shown

when installing the master cylinder assembly to the brake booster.

• Use new master cylinder assembly nuts and O-ring for installation.

CAUTION:

Do not reuse the master cylinder assembly nuts or O-ring.

• Refill the brake fluid and bleed the brake system. Refer to 

BR-20,

"Bleeding Brake System"

.

CAUTION:

• Refill using recommended brake fluid. Refer to 

BR-20,

"Drain and Refill"

.

• Do not reuse drained brake fluid.

• Adjust the brake pedal. Refer to 

BR-17, "Inspection and Adjust-

ment - Standard Pedal"

, 

BR-18, "Inspection and Adjustment - Adjustable Pedal"

.

VK56DE

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AWFIA0864GB

August 2012

2012 Pathfinder

BR-34

< REMOVAL AND INSTALLATION >

BRAKE MASTER CYLINDER

REMOVAL

CAUTION:

• Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is

splashed on painted areas, wash it away with water immediately. 

• Before removing brake master cylinder, depress the brake pedal 5-6 times with the key OFF to

deplete vacuum in the booster.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Remove master cylinder reservoir cap. 
2. Disconnect harness connectors for fluid level sensor, rear pressure sensor and front pressure sensor.
3. Disconnect brake pipes from the master cylinder assembly, using suitable tool.
4. Remove the master cylinder assembly nuts and discard.

CAUTION:

Discard the nuts, do not reuse.

5. Remove the master cylinder assembly and O-ring.

CAUTION:

Do not reuse O-ring.

INSTALLATION

Installation is in the reverse order of removal.

• Apply silicone grease to the brake booster at position (A) as

shown, be sure O-ring is in the proper position when installing the

master cylinder assembly to the brake booster.

• Use new master cylinder assembly nuts and O-ring for installation.

CAUTION:

Do not reuse the master cylinder assembly nuts or O-ring.

• Refill the brake fluid and bleed the brake system. Refer to 

BR-20,

"Bleeding Brake System"

.

CAUTION:

• Refill using recommended brake fluid. Refer to 

BR-20,

"Drain and Refill"

.

• Do not reuse drained brake fluid.

• Adjust the brake pedal. Refer to 

BR-17, "Inspection and Adjustment - Standard Pedal"

, 

BR-18, "Inspection

and Adjustment - Adjustable Pedal"

.

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 (Ploy Butyl Cuprisil) grease or 
silicone based grease

B.

Brake fluid

R.

Rubber grease

Front

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August 2012

2012 Pathfinder

BRAKE BOOSTER

BR-35

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BRAKE BOOSTER

Removal and Installation

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AWFIA0463GB

1.

Brake booster vacuum hose

2.

Brake booster vacuum check valve 3.

Brake booster

4.

Lock nut

5.

Gasket

6.

Spacer block

Front

August 2012

2012 Pathfinder

BR-36

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER

VK56DE

REMOVAL 

CAUTION:

• Be careful not to deform or bend brake piping while removing and installing brake booster.

• Replace clevis pin if it is damaged.

• Be careful not to damage brake booster stud bolt threads. If brake booster is tilted or inclined during

installation, dash panel may damage the threads.

• Attach the check valve in the correct direction.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Remove the ABS actuator and electric unit (control unit). Refer to 

BRC-231, "Removal and Installation"

.

2. Remove the master cylinder assembly. Refer to 

BR-32, "Removal and Installation"

.

3. Disconnect brake booster vacuum hose from the brake booster. Refer to 

BR-38, "Removal and Installa-

tion"

.

4. Disconnect the active booster and delta stroke sensor harness connector (if equipped).
5. Remove the brake pedal clevis pin (2) and snap pin (1) from

inside the vehicle. 

6. Remove the brake booster and brake pedal assembly nuts and discard.

CAUTION:

Discard the nuts, do not reuse.

7. Remove brake booster assembly from dash panel.

INSTALLATION

AWFIA0416GB

1.

Reservoir tank

2.

Master cylinder assembly

3.

Gasket

4.

Brake pedal

5.

Lock nut

6.

Spacer block

7

Brake booster

8.

Active booster

9.

Delta stroke sensor

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2012 Pathfinder

BRAKE BOOSTER

BR-37

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1. Loosen the lock nut to adjust the input rod so that length (B) is

within the specified value.

2. After adjusting input rod length (B), temporarily tighten the lock

nut (1) and install the booster assembly to the dash panel.

• Install gaskets and spacer block between the booster assem-

bly and the dash panel.

3. Connect the input rod using the brake pedal clevis pin (2) and

snap pin (1) from inside the vehicle. 

4. Install the brake booster using new nuts.

CAUTION:

Do not reuse the brake booster and brake pedal assembly nuts.

5. Install the brake piping to the brake master cylinder. Refer to 

BR-26, "Hydraulic Circuit"

.

6. Connect the active booster and delta stroke sensor harness connectors (if equipped).
7. Connect the brake booster vacuum hose and check valve to the brake booster.
8. Install the master cylinder assembly. Refer to 

BR-32, "Removal and Installation"

.

9. Adjust the brake pedal height. Refer to 

BR-17, "Inspection and Adjustment - Standard Pedal"

, 

BR-18,

"Inspection and Adjustment - Adjustable Pedal"

.

10. Tighten the input rod lock nut to specification.
11. Refill with new brake fluid and bleed the brake system. Refer to 

BR-20, "Drain and Refill"

.

Input rod installation length (B) : Refer to 

BR-60, "Brake 

Booster"

.

WFIA0382E

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August 2012

2012 Pathfinder

BR-38

< REMOVAL AND INSTALLATION >

VACUUM LINES

VACUUM LINES

Removal and Installation

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Brake Booster Vacuum Hose

REMOVAL

1. Disconnect brake booster hose from hose clip bracket.
2. Release the brake booster hose clamps and remove the brake booster hose. 
3. Remove the brake booster vacuum check valve from the brake booster.

INSTALLATION

Installation is in the reverse order of removal.

• Insert brake booster hose onto tube and brake booster vacuum

check valve for a minimum length (A) before installing the brake

booster hose clamps.

CAUTION:

Do not use lubricating oil during installation.

WFIA0332E

1.

Brake booster hose

2.

Brake booster hose clamp

3.

Brake booster vacuum check valve

Brake booster hose length (A) : 24 mm (0.94 in) or more

JPFIA0023ZZ

August 2012

2012 Pathfinder