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Home >> Volvo >> 2004 >> V70 R, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Disc) >> Component Tests >> Power Brake Booster >> Power Booster Function Check

Power Booster Function Check

WARNING: This page is about a different variant/trim than selected.
  1. Depress the brake pedal several times to vent vacuum from booster. Brake pedal will feel hard when all vacuum is released.
  2. Hold brake pedal down and start engine. Pedal should move down and feel softer.
  3. Release brake pedal and turn engine off. Wait 1 minute then depress brake pedal. Pedal should still feel soft but should become stiffer after it is depressed several times.
  4. Ensure no leakage is present between vacuum hose and fitting at power brake booster. Ensure no leakage is present between master cylinder and power brake booster.
  5. If vacuum is present at check valve, replace power brake booster if pedal feels hard and unresponsive when engine is idling. See POWER BRAKE BOOSTER  under REMOVAL & INSTALLATION.
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