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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Disc Brakes & Drum Brakes >> Component Tests >> Power Brake Booster/Master Cylinder Functional Test

Power Brake Booster/Master Cylinder Functional Test

  1. Start engine, and check booster vacuum hose connections. A hissing noise indicates a vacuum leak. Repair any vacuum leaks before proceeding.
  2. Stop engine, and shift transmission into Neutral. Pump brake pedal until all vacuum reserve in booster is depleted.
  3. Hold brake pedal under light pressure. If pedal does not hold firm and falls away, master cylinder may be faulty. Go to next step. If pedal holds firm, go to step  5.
  4. Bleed system using appropriate method, and repeat step  1. See BRAKE SYSTEM BLEEDING  under BLEEDING BRAKE SYSTEM.
  5. Start engine and observe pedal height. If pedal height change is not apparent, power booster or vacuum check valve is faulty. See POWER BRAKE BOOSTER VACUUM TEST . If pedal falls away slightly under light pressure and then holds firm, go to next step.
  6. Start engine. Release brake pedal. Increase engine speed to 1500 RPM. Close throttle and immediately turn off ignition. Wait at least 90 seconds, and try brake action again. Booster should provide 2 or more vacuum-assisted pedal applications. If vacuum assist is not provided, booster is faulty See POWER BRAKE BOOSTER  under REMOVAL & INSTALLATION.
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