Pinpoint Test A: The Parking Brake Will Not Release
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- A1 CHECK FOR VACUUM NOTE: When checking for vacuum leaks, look for cracks or holes in the hoses and connections.
- Block the wheels.
- Connect a vacuum gauge to the parking brake vacuum release control motor vacuum hose.
- Start the engine and run at idle speed.
- Depress the brake pedal.
- Shift the transmission into DRIVE.
- Is the vacuum 34 kPa (10 in Hg)?
Yes : GO to A4.
No : GO to A2.
- A2 CHECK FOR VACUUM SUPPLY TO THE PARKING BRAKE VACUUM RELEASE SWITCH
- Press the brake pedal.
- Shift the transmission into PARK.
- Disconnect the parking brake vacuum release switch vacuum hose at the in-line connector.
- Is vacuum present?
NOTE: The vacuum supply to the parking brake vacuum release switch can be checked at the in-line hose connector below the instrument panel.Yes : GO to A3.
No : REPAIR the vacuum supply.
- A3 CHECK THE PARKING BRAKE VACUUM RELEASE SWITCH
- Apply vacuum to the parking brake vacuum release switch inlet hose using a vacuum tester.
- Can vacuum be maintained?
Yes : CHECK for binding or sticking mechanical parking brake components. GO to SYMPTOM CHART .
No : INSTALL a new parking brake vacuum release switch. TEST the system for normal operation.
- A4 CHECK THE PARKING BRAKE VACUUM RELEASE MOTOR
- Apply vacuum to the parking brake vacuum release motor using a vacuum tester.
- Can vacuum be maintained?
Yes : INSTALL a new parking brake control. REFER to PARKING BRAKE CONTROL . TEST the system for normal operation.
No : INSTALL a new parking brake vacuum release motor. TEST the system for normal operation.