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Home >> Plymouth >> 1992 >> Sundance Base, 2D Hatchback, 2.2 D, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Disc & Drum) >> Testing >> Power Brake Unit

Power Brake Unit

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1991 Plymouth Sundance, 1991 Plymouth Acclaim, 1991 Dodge Spirit, 1991 Dodge Shadow, and 1991 Dodge Dynasty. However, it is still accessible from the selected car via links, so may be relevant.
  1. Run engine for 2 minutes. Turn off engine. Press brake pedal several times with normal pressure. Pedal height should be lowest when first pressed but should gradually become higher each time pedal is pressed.
  2. With engine stopped, step on brake pedal several times to ensure pedal height does not change. Press and hold brake pedal and start engine. Pedal should move down slightly.
  3. With engine running, press and hold brake pedal down; stop engine. Continue holding pedal down for 30 seconds. Pedal height should not increase.
  4. If power brake unit does not test as specified, inspect vacuum hose. If vacuum hose is okay, replace power brake unit.
CAUTION: DO NOT  remove check valve from booster. DO NOT  disassemble power brake unit. Booster is serviced as a complete unit only.
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