1. Apply the park brake.
2. Observe the park brake pump motor.

Does the park brake pump motor continue to run?

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Go to Park Brake Pump Motor Runs Continuously

Go to Step 2

Observe the park brake pressure solenoid valve while disconnecting the park brake pressure solenoid valve.

Does the park brake pressure solenoid valve click when it is disconnected?

Go to Step 3

Go to Step 5

1. Disconnect the dash park brake switch harness connector.
2. Connect a test lamp from the dash park brake switch harness connector terminal B to chassis ground.

Does the test lamp light?

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Go to Step 4

Go to Step 8

Locate and repair the short to voltage in CKT 1931 (YEL/BLK) between the dash park brake switch, the park brake control module, and the park brake pressure solenoid valve.

Is the repair complete?

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System OK

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1. Connect a DMM from the park brake pressure solenoid valve terminal A to B.
2. Measure the resistance.

Is the resistance between the specified limits?

5.2 ohms-5.7 ohms@ 25°C (77°F)

Go to Step 6

Go to Step 7

1. Slowly loosen the pipe fitting between the actuator and the park brake pressure solenoid valve.
2. Observe if any fluid is leaving the fitting.

Is any fluid leaving the fitting?

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Go to Step 7

Go to Park Brake Pressure Sensor Circuit Check

Replace the park brake pressure solenoid valve. Refer to Park Brake Solenoid Valve Replacement .

Is the repair complete?

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System OK

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Replace the dash park brake switch. Refer to Instrument Panel Park Brake Switch Replacement .

Is the repair complete?

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System OK

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