Nissan March K13. Manual - part 39
BRAKE BOOSTER
BR-29
< REMOVAL AND INSTALLATION >
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BR
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Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it
off immediately and wash with water if it gets on a painted surface.
Note the following, and install in the reverse order of removal.
• Be careful not to damage brake booster stud bolt threads. If brake booster is tilted during installation, the
dash panel may damage the threads.
• Never deform or bend the brake tubes.
• Always use a new gasket between the brake booster and the dash panel.
• Replace the clevis pin if it is damaged. Refer to
BR-17, "Inspection and Adjustment"
• Never allow foreign matter (e.g. dust) and oils other than brake fluid to enter the reservoir tank.
• After installation, perform the air bleeding. Refer to
BR-10, "Bleeding Brake System"
.
CAUTION:
Never reuse drained brake fluid.
• Check each item of brake pedal. Adjust it if the measurement value is not the standard. Refer to
.
Inspection and Adjustment
INFOID:0000000005986595
INSPECTION BEFORE REMOVAL
Air Tight
CAUTION:
Check the air tight condition when the master cylinder and the brake booster is installed.
1.
With a handy vacuum pump, apply vacuum pressure of
−
66.7 kPa (
−
500 mmHg,
−
19.70 inHg,
−
0.667 bar)
to the brake booster.
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.
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 pane decreases.
Air Tight
1.
Run the engine for 1 minute to apply vacuum to the brake booster, and stop the engine. Then 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.
2.
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
A
: Refer to
.
JPFIA0238ZZ