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Pinpoint Test G: EXCESSIVE BRAKE PEDAL EFFORT

WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK BRAKE PADS 
    1. Check the brake pads for wear, contamination, correct installation, damage and type.

    Are any concerns found? 

    YES:  INSTALL the front brake pads correctly or INSTALL new front brake pads if necessary. Refer to Brake Pads - Vehicles With: Standard Brakes information. INSTALL the rear brake pads correctly or INSTALL new rear brake pads if necessary and Brake Pads - Vehicles With: Standard Brakes information. TEST the system for normal operation. REPEAT road test.

    NO:  Go to step  2.

  2. CHECK VACUUM 
    1. Disconnect the vacuum hose from the brake booster.
    2. Connect a vacuum/pressure tester to the vacuum hose.
    3. Run the engine at normal operating temperature.
    4. Record the vacuum reading.

    Is the reading 40.5 kPa (12 in-Hg) or greater? 

    YES:  Go to step  3.

    NO:  LOCATE and REPAIR the source of low vacuum. TEST the system for normal operation.

  3. INSPECT SYSTEM 
    1. Switch the engine off.
    2. Reconnect the vacuum hose.
    3. Inspect the brake booster, rubber grommet, and all vacuum plumbing for cracks, holes, damaged connections, or missing clamps.
    4. Pump the brake pedal several times to exhaust the vacuum. Push down on the brake pedal and hold.

    Does the brake pedal move down when the engine is started? 

    YES:  Vacuum system is OK.

    NO:  Go to step  4.

  4. CHECK POWER BRAKE BOOSTER VALVE 
    1. Check the brake booster valve. For additional information, refer to Brake Booster component test in this section.

    Is the power brake booster valve OK? 

    YES:  CHECK the brake booster. For additional information, refer to Brake Booster component test in this section. INSTALL a new brake booster if necessary. Refer to Brake Booster - RHD and Brake Booster - LHD information. TEST the system for normal operation.

    NO:  INSTALL a new brake booster valve. TEST the system for normal operation.

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