Infiniti QX56 (JA60). Manual - part 116

 

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Infiniti QX56 (JA60). Manual - part 116

 

 

BR-24

< ON-VEHICLE REPAIR >

BRAKE TUBE AND HOSE

1. Check brake lines (tubes 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-13, "Hydraulic Cir-

cuit"

.

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.

BRAKE MASTER CYLINDER

BR-25

< ON-VEHICLE REPAIR >

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BRAKE MASTER CYLINDER

Removal and Installation

INFOID:0000000005147909

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.

1. Remove brake reservoir cap.
2. Disconnect harness connectors for fluid level sensor, front and rear pressure sensors.
3. Using suitable tool, disconnect brake tube from master cylinder assembly.
4. Remove master cylinder assembly nuts, and remove master cylinder assembly.

INSTALLATION

Installation is in the reverse order of removal.

• Refill brake fluid and bleed air. Refer to 

BR-17, "Bleeding Brake System"

.

CAUTION:

• Refill with new brake fluid. Refer to 

MA-13, "Fluids and Lubricants"

.

• Do not reuse drained brake fluid.

• Adjust brake pedal. Refer to 

BR-15, "Inspection and Adjustment"

 .

1.

Reservoir cap

2.

Fluid level sensor

3.

Grommet

4.

Master cylinder assembly

5.

Front pressure sensor

6.

Rear pressure sensor

7.

Seal

8.

Reservoir tank

B.

Brake fluid

R.

Rubber grease

AWFIA0415GB

BR-26

< ON-VEHICLE REPAIR >

BRAKE BOOSTER

BRAKE BOOSTER

Removal and Installation

INFOID:0000000005147910

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.

REMOVAL 

1. Remove engine room cover. Refer to 

EM-24, "Removal and Installation"

.

2. Remove engine air duct assembly. Refer to 

EM-25, "Removal and Installation"

.

3. Remove cowl top extension. Refer to 

EXT-18, "Removal and Installation"

.

4. Remove master cylinder assembly from brake booster. Refer to 

BR-25, "Removal and Installation"

.

5. Remove vacuum hose from brake booster. Refer to 

BR-28, "Removal and Installation"

.

6. Disconnect active boost and delta stroke sensor harness connectors from brake booster.
7. Remove instrument lower panel LH. Refer to 

IP-14, "Exploded View"

.

8. Remove brake pedal to clevis attachment snap pin and clevis pin from inside the vehicle. 
9. Remove brake booster to brake pedal assembly nuts.
10. Reposition the A/C line out of the way.
11. Remove brake booster and spacer block from dash panel.

INSPECTION AFTER REMOVAL

Output Rod Length Inspection

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

AWFIA0416GB

BRAKE BOOSTER

BR-27

< ON-VEHICLE REPAIR >

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1. Using a hand vacuum pump, apply a vacuum of – 66.7 kPa (–

500 mmHg, –19.69 inHg) to brake booster.

2. Check output rod length.

INSTALLATION

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

is set at the specified value.

2. After adjusting length (B), temporarily tighten lock nut and install

brake booster and spacer block.

• Install the gaskets and spacer block between brake booster

and dash panel.

3. Connect brake pedal to clevis on the input rod.
4. Install brake booster to brake pedal assembly nuts and tighten

to the specified torque.

5. Connect active boost and delta stroke sensor harness connectors to brake booster.
6. Connect vacuum hose to brake booster.
7. Install master cylinder assembly to brake booster. Refer to 

BR-25, "Removal and Installation"

.

8. Adjust the height and play of brake pedal. Refer to 

BR-15, "Inspection and Adjustment"

.

9. Tighten lock nut of input rod to specification.
10. Install instrument lower panel LH. Refer to 

IP-14, "Removal and Installation"

.

11. Secure A/C line into clips.
12. Install cowl top extension. Refer to 

EXT-18, "Removal and Installation"

.

13. Install engine air duct assembly. Refer to 

EM-25, "Removal and Installation"

.

14. Install engine room cover. Refer to 

EM-24, "Removal and Installation"

.

15. Refill with new brake fluid and bleed air. Refer to 

BR-17, "Bleeding Brake System"

.

Output rod length

: Refer to 

BR-46, "Brake 

Booster"

.

SBR208E

Input rod length (B)

Refer to 

BR-46, "Brake 

Booster"

.

WFIA0382E

 

 

 

 

 

 

 

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