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Master Cylinder/Power Booster

  1. Start engine. Check power booster vacuum hose for leaks. Repair as required. Stop engine. Place gear selector in Neutral. Pump brake pedal until all vacuum reserve is depleted.
  2. Press and hold brake pedal under light foot pressure. If pedal does not hold firm and falls away, master cylinder is leaking internally. Repair or replace as required. If brake pedal holds firm, proceed to next step.
  3. While holding light pressure on pedal, start engine, and note pedal action. If no pedal action is noticeable, power booster or vacuum check valve is faulty. Replace check valve, and repeat test. If pedal falls away slightly then holds firm, proceed to next step.
  4. Release brake pedal. Increase engine speed to 1500 RPM, close throttle and immediately stop engine. Wait at least 90 seconds and retest pedal action. Booster should provide 2 or more vacuum assisted pedal applications. If pedal action is not as specified, perform CHECK VALVE & POWER BOOSTER VACUUM test.
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