Nissan Frontier D22. Manual - part 163

BRAKE BOOSTER

BR-19

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BRAKE BOOSTER

PFP:47200

On-vehicle Service

EFS003FN

OPERATING CHECK

●

Depress brake pedal several times with engine off. After
exhausting vacuum, make sure there is no change in pedal
stroke.

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Depress brake pedal, then start engine. If pedal goes down
slightly, operation is normal.

AIRTIGHT CHECK

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Start engine, and stop it after one or two minutes. Depress brake pedal several times slowly. Booster is
airtight if pedal stroke is less each time.

●

Depress brake pedal while engine is running, and stop engine with pedal depressed. The pedal stroke
should not change after holding pedal down for 30 seconds.

Removal and Installation

EFS003FO

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.

●

Be careful not to deform or bend brake pipes during
removal of booster.

SBR002A

SBR365AA

LBR124

BR-20

BRAKE BOOSTER

INSPECTION AFTER REMOVAL

1.

Apply vacuum of 

−66.7 kPa (−500 mmHg, −19.69 inHg) to brake

booster with a hand vacuum pump.

2.

Add preload of 19.6 N (2.0 kg, 4.4 lb) to output rod length.

3.

Check output rod length.

INSTALLATION

CAUTION:

●

Be careful not to deform or bend brake pipes during instal-
lation of booster.

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Replace clevis pin if damaged.

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Refill with new brake fluid “DOT 3”.

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Never reuse drained brake fluid.

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Take care not to damage brake booster mounting bolt
thread when installing. Due to the narrow angle of installa-
tion, the threads can be damaged by the dash panel.

1.

Before fitting booster, temporarily adjust clevis to dimension shown.

2.

Fit booster, then secure mounting nuts (brake pedal bracket to brake booster) lightly.

3.

Connect brake pedal and booster input rod with clevis pin.

4.

Secure brake booster nuts.

5.

Install master cylinder. Refer to 

BR-15, "INSTALLATION"

 .

6.

Adjust brake pedal height and free play. Refer to 

BR-8, "Adjustment"

 .

7.

Secure lock nut for clevis.

8.

Bleed air. Refer to 

BR-10, "Bleeding Brake System"

 .

Output 
rod length 

: 10.275 - 10.525 mm (0.4045 - 0.4144 in)

ABR875

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KA24DE

: 160 mm (6.30 in)

VG33E and VG33ER

: 165 mm (6.50 in)

Brake booster nuts

: 13 - 16 N·m (1.3 - 1.6 kg-m, 9 - 12 ft-lb)

Lock nut 

: 16 - 22 N·m (1.6 - 2.2 kg-m, 12 - 16 ft-lb)

SBR116BE

SBR930

VACUUM LINES

BR-21

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VACUUM LINES

PFP:41920

Removal and Installation

EFS003FP

CAUTION:

When installing vacuum hoses, pay attention to the following points.

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Do not apply any oil or lubricants to vacuum hose with
check valve.

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Insert vacuum tube into vacuum hose as shown.

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Install vacuum hose with internal check valve, paying atten-
tion to its direction.

LBR159

SBR225B

BR-22

VACUUM LINES

Inspection

EFS003FQ

VISUAL INSPECTION

Check vacuum lines and connections for airtightness, improper attachment, chafing and deterioration.

CHECK VALVE INSPECTION

Check vacuum with a vacuum pump.

Connect to booster side

Vacuum should exist.

Connect to engine side

Vacuum should not exist.

SBR844B