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Functional Test

WARNING: This page is about a different car, the 2001 Acura MDX, 2001 Acura 3.5RL, 2001 Acura 3.2TL, and 2001 Acura 3.2CL. 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 .38" (10 mm) on MDX models or 1.0" (25 mm) on 3.2CL, 3.2TL and 3.5RL models 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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