Nissan Quest E52. Manual - part 222

BR-32

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER

• Replace the clevis pin if it is damaged. Refer to 

BR-19, "Inspection and Adjustment"

.

• Perform the air bleeding. Refer to 

BR-11, "Bleeding Brake System"

.

• Check each item of brake pedal. Adjust it if the measurement value is not the standard. Refer to 

BR-7,

"Inspection and Adjustment"

.

Inspection and Adjustment

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INSPECTION BEFORE REMOVAL

Air Tight

CAUTION:

Check the air tight condition when the master cylinder and the brake booster is installed.

1.

Check the air tight use a handy vacuum pump.

2.

If the air tight condition cannot be maintained, perform the following operation.

a.

Check the no dirt and dust are present on the brake booster and brake master cylinder mating faces.
Clean it if necessary.

b.

Check the O-ring on the master cylinder. If anything is found, replace the O-ring. Refer to 

BR-27,

"Removal and Installation"

.

c.

Check the air tight condition again. If the condition still cannot be maintained, replace the brake booster.

INSPECTION AFTER REMOVAL

Input Rod Length Inspection

1.

Loosen the lock nut (1) and adjust the input rod (2) to the speci-
fied length (A).

2.

Tighten the lock nut to the specified torque.

INSPECTION AFTER INSTALLATION

Operation

Depress the brake pedal several times at 5-second intervals with the engine stopped. Start the engine with the
brake pedal fully depressed. Check that the clearance between brake pedal and dash lower panel decreases.
NOTE:
A slight impact with a small click may be felt on the pedal when the brake pedal is fully depressed. This is a
normal phenomenon due to the brake system operation.

Air Tight

1.

Run the engine at idle for 1 minute to apply vacuum to the brake booster, and stop the engine.

2.

Depress the brake pedal several times at 5-second intervals until the accumulated vacuum is released to
atmospheric pressure. Check that the clearance between brake pedal and dash lower panel gradually
increases each time the brake pedal is depressed when performing this operation.

3.

Depress the brake pedal with the engine running. Then stop the engine while holding down the brake
pedal. Check that the brake pedal stroke does not change after holding down the brake pedal for 30 sec-
onds or more.

ADJUSTMENT AFTER INSTALLATION

Perform the brake pedal adjustment after installing the brake pedal assembly. Refer to 

BR-7, "Inspection and

Adjustment"

.

At vacuum of 

−

66.7 kPa (

−

500 mmHg, 

−

19.69 inHg)

: Vacuum should decrease within 3.3 kPa (24.8 mmHg, 
0.98 inHg) for 15 seconds.

A

: Refer to 

BR-51, "Brake Booster"

.

JPFIA0238ZZ

VACUUM LINES

BR-33

< REMOVAL AND INSTALLATION >

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VACUUM LINES

Exploded View

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Removal and Installation

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REMOVAL

1.

Remove air duct and air cleaner case. Refer to 

EM-26, "Removal and Installation"

.

2.

Remove the vacuum hose and vacuum piping.

3.

Perform inspection after removal. Refer to 

BR-33, "Inspection"

.

INSTALLATION

Note the following, install to the vacuum hose.
• The check valve built-in the vacuum hose must face the right direction, referring to 

BR-33, "Exploded View"

.

If the vacuum hose is installed in the wrong direction, the brake booster may not operate normally.

• When installing vacuum hose, insert it until its tip reaches the

back-end of length (A) or further as shown in the figure.

CAUTION:

Never use lubricating oil during assembly.

- Face the paint mark of vacuum piping (brake booster side) and

vacuum hose (intake manifold side) to vehicle front to assemble.

- Face the other paint marks upward to assemble.
- For clamp mounting direction (the orientation of pawl), refer to 

BR-

33, "Exploded View"

.

- Install clip to the correct position, refer to 

BR-33, "Exploded View"

.

CAUTION:

Both cooler pipe and vacuum piping must be clipped.

Inspection

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INSPECTION AFTER REMOVAL

1.

Clamp

2.

Vacuum hose (check valve built-in)

3.

Vacuum piping

4.

Clip

5.

Vacuum hose

A.

To intake manifold

B.

Paint mark

C.

Stamp indicating engine direction

D.

To brake booster

JSFIA0963ZZ

A

: 24 mm (0.95 in) or more

JPFIA0023ZZ

BR-34

< REMOVAL AND INSTALLATION >

VACUUM LINES

Appearance

Check for correct assembly, damage and deterioration.

Check Valve Airtightness

• Use a handy vacuum pump (A) to check.

• Replace vacuum hose if vacuum hose and check valve are mal-

functioning.

When connected to the booster side (B):

Vacuum should decrease within 1.3 kPa (9.8 mmHg, 
0.38 inHg) for 15 seconds under a vacuum of 

−

66.7 

kPa (

−

500 mmHg, 

−

19.70 inHg).

When connected to the engine side (C):

Vacuum should not exist.

JPFIA0024ZZ

FRONT DISC BRAKE

BR-35

< REMOVAL AND INSTALLATION >

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FRONT DISC BRAKE

BRAKE PAD

BRAKE PAD : Exploded View

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Molykote is a registered trademark of Dow Corning Corporation.

BRAKE PAD : Removal and Installation

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REMOVAL

WARNING:

Since dust covering the front brake has an affect on human body, the dust must be removed with a
dust collector. Never splatter the dust with an air blow gun.

CAUTION:

• Never depress the brake pedal while removing the brake pads because the piston may pop out.
• If the brake fluid or grease adheres to the disc rotor or the cylinder body, quickly wipe it off.

1.

Remove tires with power tool.

2.

Remove sliding pin bolt (lower side) from cylinder body.

1.

Sliding pin bolt

2.

Cylinder body

3.

Inner shim cover

4.

Inner shim

5.

Inner pad (with pad wear sensor)

6.

Pad return spring

7.

Pad retainer

8.

Torque member

9.

Outer pad

10.

Outer shim

11.

Outer shim cover

1: Apply rubber grease.

2: Apply MOLYKOTE

®

 AS880N or silicone-based grease.

3: Apply MOLYKOTE

®

 7439 or equivalent.

: N·m (kg-m, ft-lb)

JSFIA0578GB

JSFIA0579ZZ