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Home >> Toyota >> 1998 >> RAV4 Base, 2D Utility, AWD, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> Testing >> Power Brake Unit >> Functional Test

Functional Test

  1. Start engine. Turn ignition off. Depress brake pedal several times. Depress pedal firmly and hold pressure for 15 seconds. If pedal sinks, master cylinder, wheel cylinder, caliper or brakeline is faulty.
  2. Start engine with pedal depressed. If pedal sinks slightly, vacuum unit is working properly. If pedal height does not vary, booster or check valve is faulty. Replace as necessary.
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