Brake system
P-7
Installation instructions of stop pin
1. Aim the piston bore at the stop pin and fit on the
2nd piston and return spring.
2. Fit on the stop pin.
3. Push in and release the piston to confirm that the
piston can be locked by the stop pin.
Check of vacuum booster
Check the function of vacuum booster (simple method)
Attention:
Replace the vacuum booster when necessary.
Method 1
1. Shut down the engine; step down the brake pedal several times.
2. Hold pressed the brake pedal and start the engine.
3. If the pedal displaces slight downward after the engine started, it means that the vacuum booster is in
normal operation.
Method 2
1. Start the engine.
2. After the engine run for 1 or 2mins., shut down the engine.
3. Step down the brake pedal by the normal force, and hold it for 3-5s, so to allow the pressure difference
between the front and rear cavities equal to zero.
4. If the 1
st
travel of stepped pedal is long, and the 2
nd
becomes shorter, it means that the vacuum booster is
in normal operation.
5. Attention:
If any problems found, inspect whether the check valve and vacuum booster hose are damaged and their
installation, repair or replace when necessary, and then check again.
Method 3
1. Start the engine.
2. Step down the brake pedal by normal force.
3. Hold the brake pedal on the depressed position and shut down the engine.
4. Hold the brake pedal on the depressed position for about 30s.
5. If there is no change in the height of brake pedal, it means that the vacuum booster is in normal
operation.
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