Page 1806 - Foton Workshop Manual - Tunland (AT)

35-16 BRAKE - MASTER BRAKE CYLINDER VACUUM BOOSTER

ON-VEHICLE INSPECTION

1 . Check the Performance of the Vacuum
Booster
(a) Before starting the engine, press the brake
pedal several times and measure the height
of the brake pedal, which shall remain
unchanged.

(b) Press the brake pedal and start the engine.
If the brake pedal slightly sinks, it means the
vacuum booster is in normal condition.

2 . Check the Air-tightness of the Vacuum
Booster
35 (a) Switch off the engine after running 1-2
minutes. Press the brake pedal several times
(1st, 2nd and 3rd times). If the brake pedal
rises gradually, it means the vacuum booster
is in good air-tightness.
(b) When the engine is running, press the brake
pedal and then switch of the engine. If the
height of the pedal remains unchanged within
30 seconds, it means the vacuum booster is
in good air-tightness. If it continues to sink, it
means the air-tightness is inferior and needs
overhaul.

Page 1806