Diagnostic Information And Procedures; Power Booster Functional Check; Check Valve Functional Check - Daewoo MATIZ Service Manual

DIAGNOSTIC INFORMATION AND PROCEDURES

POWER BOOSTER FUNCTIONAL
CHECK
1. With the engine stopped, eliminate the vacuum in the
booster by pumping the brake pedal several times.
2. Push the pedal down and hold it in this position.
3. Start the engine.
4. The booster is OK if the pedal drops further because
of extra force produced.
If the brake pedal does not drop, the vacuum system
(vacuum hoses, check valve, etc.) is probably defective
and should be checked.
If no defect is revealed by checking the vacuum system,
the defect is in the booster itself.

CHECK VALVE FUNCTIONAL CHECK

1. Remove the vacuum hose.
2. Suck the vacuum hose to power booster. And also,
suck the vacuum hose to engine.
3. If the air pass through the check valve or not, replace
the check valve. And if the vacuum hose to engine is
DAEWOO M-150 BL2
POWER BOOSTER 4C – 3
only sucked, the check valve OK.
D17A301B