Basic Test
WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
- With engine off, depress and release brake pedal several times to purge all vacuum from power brake booster.
- Depress and hold pedal with light pressure of about 15-25 lbs. (6.8-11.3 kg), then start engine. Pedal should fall slightly, then hold. Less effort should be needed to apply the pedal at this time. If pedal did not fall, go to next step. If the pedal fell, perform vacuum leak test. See VACUUM LEAK TEST .
- Disconnect vacuum hose on side of vacuum check valve that leads to speed control, then connect a vacuum gauge to open vacuum port on valve.
- Start engine
- When engine is at normal operating temperature, allow it to idle and check vacuum at gauge. If vacuum supply is 12 in. Hg or more, power brake booster is defective and must be replaced. See POWER BRAKE BOOSTER under REMOVAL & INSTALLATION. If vacuum supply is less than 12 in. Hg, go to next step.
- Shut off engine.
- Connect vacuum gauge to vacuum reference port on engine intake manifold.
- Start engine and observe vacuum gauge. If vacuum is still low, check engine (tune and repair as necessary). If vacuum is greater than 12 in. Hg, hose or check valve to booster has a restriction or leak. Once an adequate vacuum supply is obtained, repeat testing.