Index Subaru Subaru Impreza 3 / Impreza WRX / Impreza WRX STI - service repair manual 2008-2014 year
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BR-37 Brake Booster BRAKE 1. OPERATION CHECK (WITHOUT GAUG- ES) CAUTION: When checking operation, be sure to apply the parking brake securely. defective. But it is possible to identify the outline of the defect by performing the check according to the following procedures. turn it OFF. Depress the brake pedal several times applying the normal pedal force. The pedal stroke should be the longest at the 1st depression, and it should become shorter at each successive depres- sion. If no change occurs in the pedal height when pressed, the brake booster is faulty. NOTE: • In case of defective operation, inspect the condi- tion of the check valve and vacuum hose as well. • Replace them if faulty, and perform the test again. • If no improvement is observed, check precisely with gauges. • Check operation al several times applying the same pedal force, to check for a change in pedal height. 2) With the brake pedal depressed, start the en- gine. 3) As the engine starts, the brake pedal should move slowly toward the floor. If the pedal height does not change, the brake booster is faulty. If faulty, check precisely with gauges. ning, and turn the engine to OFF while the pedal is depressed. Keep the pedal depressed for 30 sec- onds. If the pedal height does not change, the func- tion of brake booster is normal. If the pedal height increases, it is faulty. If faulty, check precisely with gauges. (1) Normal BR-00080 (1) (3) (4) (5) (2) (1) When engine is stopped BR-00081 (1) (2) |