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Home >> Acura >> 1998 >> 3.0CL >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Disc Brakes) >> Testing >> Power Brake Unit >> Functional Test

Functional Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1998 Acura 3.5RL, 1998 Acura 3.2TL, 1998 Acura 2.5TL, 1997 Acura 3.5RL, and 1997 Acura 3.2TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Press brake pedal several times. Press and hold pedal firmly for 15 seconds. If pedal sinks, master cylinder, brakeline, or caliper piston is faulty.
  2. Start engine with pedal depressed. If pedal sinks slightly, vacuum unit is working properly. If pedal height does not change, booster or check valve is faulty.
  3. With engine idling and transmission in Drive, depress brake pedal enough to hold back transmission creep. If brake pedal sinks more than 1.0" (25 mm) in 3 minutes, master cylinder is faulty. There should be a slight pedal height change when A/C compressor cycles on and off.
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