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Home >> Chrysler >> 2001 >> Sebring LX, 2D Convertible >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Disc Brakes - Except Coupe >> Component Tests >> Power Brake System >> Vacuum Leak Test

Vacuum Leak Test

  1. Disconnect the vacuum hose on the side of the power brake booster vacuum check valve that leads to the speed control. Connect a vacuum gauge to the open vacuum port on the valve. Remove the remaining hose on the vacuum check valve that is not the vacuum supply hose coming from the intake manifold. Cap off the open port on the check valve. Start the engine.
  2. Allow the engine to warm up to normal operating temperature. While the engine is idling, use vacuum line pliers to close off the vacuum supply hose near the booster and observe the vacuum gauge.
  3. If the vacuum drop exceeds 1 in. Hg (3.3 kPa) in one minute, repeat the above steps to confirm the reading. The vacuum loss should be less than 1 in. Hg in a one minute time span. If the loss is more than 1 in. Hg, replace the power brake booster. See POWER BRAKE BOOSTER  under REMOVAL & INSTALLATION. If it is not, go to the next step.
  4. Remove the pliers from the hose temporarily. Apply light effort to the brake pedal and hold the pedal steady. DO NOT move the pedal once the pressure is applied or the test results may vary. Have an assistant reattach the pliers to the vacuum supply hose. Allow 5 seconds for stabilization, then observe the vacuum gauge. If the vacuum drop exceeds 3.0 in. Hg (10 kPa) in 15 seconds, repeat the above steps to confirm the reading. The vacuum loss should be less than 3.0 in. Hg in a 15 second time span. If the loss is more than 3.0 in. Hg, replace the power brake booster. If it is not, the booster is not defective.
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