NANO

508

BRAKE SYSTEM

3.4 BRAKE PEDAL PLAY INSPECTION :

(ii) Depress brake pedal several times with the same

effort as used while normal braking operation and

observe pedal travel. If pedal goes deep down for

first time and its travel decreases for the following

depression, then air tightness is observed.

(iii) If pedal travel doesn’t change then air tightness is

not obtained. Inspect vacuum lines and sealing

parts and replace defective parts.

(iv) Repeat the entire test after replacing defective

parts.

(b) Check operation

(i) With engine stopped, depress pedal for several

times with the same effort as used while normal

braking operation and make sure that pedal travel

doesn’t change.

(ii) Start engine and depress brake pedal. A small

increase in pedal travel indicated satisfactory

functioning of booster. But if there is no change in

pedal travel, it indicates a malfunction.

(c) Check air tightness under load :

(i) Start engine. Depress brake pedal. Stop engine

while holding the brake pedal in depressed

condition.

(ii) Hold the brake pedal in depressed condition for

30 seconds. If pedal height doesn’t change it indi-

cates proper operating condition and if pedal travel

rises it indicates malfunctioning.

Brake pedal Free Play, should be kept 1 - 2 mm as

shown above. If it is out of specification check stop

light switch for proper installation and adjust it as

necessary. Also check pedal shaft bolt for looseness.

Brake shackle pin should rotate freely on pedal.

Ensure proper lubrication applied on it.