Index Chrysler Chrysler 300M / Concorde / Interpid / LHS, Dodge Interpid - service repair manual 2000-2004 year
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The power brake booster can be identified by the tag attached to the body of the booster assembly (Fig. • the production part number • the date it was built • who manufactured it NOTE: The power brake booster assembly is not a OPERATION The purpose of the power brake booster is to reduce the amount of force required by the driver The power brake booster is vacuum operated. The vacuum is supplied from the intake manifold on the As the brake pedal is pressed, the power brake boost- er’s input rod moves forward. This opens and closes the primary piston of the master cylinder. As the pis- DIAGNOSIS AND TESTING - POWER BRAKE BASIC TEST (1) With engine off, depress and release the brake pedal several times to purge all vacuum from the (2) Depress and hold the pedal with light effort (15 to 25 lbs. pressure), then start the engine. The pedal should fall slightly, then hold. Less effort should be needed to apply the pedal at this time. If the (3) Disconnect the vacuum hose on the side of the vacuum check valve that leads to the speed control, (4) Start the engine. ature, allow it to idle and check the vacuum at the If the vacuum supply is 12 inches Hg (40.5 kPa) or more, the power brake booster is defective and must (6) Shut off the engine. erence port on the engine intake manifold. (8) Start the engine and observe the vacuum gauge. and repair as necessary. If the vacuum is above 12 Once an adequate vacuum supply is obtained, repeat the BASIC TEST. VACUUM LEAK TEST (1) Disconnect the vacuum hose on the side of the power brake booster vacuum check valve that leads (2) Remove the remaining hose on the vacuum check valve that is not the vacuum supply hose com- (3) Start the engine. ing temperature and engine idle. (5) Using vacuum line pliers, close off the vacuum supply hose near the booster and observe the vacuum Fig. 73 Power Brake Booster Identification 1 - VACUUM CHECK VALVE LH BRAKES - BASE BRAKE SYSTEM 5 - 43 POWER BRAKE BOOSTER (Continued) |