Adjusting And Calibrating Brake Shoes

Information 

• Only make adjustments at the two adjustment devices on the rear wheels. 
• Make sure that the electric lines for the parking brake are routed and guided correctly. 

Information 

After checking the brakes, it may be necessary to fine-tune the adjustment device.

1. Raise the vehicle.

   > Lifting the vehicle 

2. Remove wheels.

   > Removing and installing wheel 

3. Unscrew and remove screw plug -1-  on the relevant brake disc.

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   Screw plug for brake disc

   In the event of unfavorable tolerances, the brake pads may prevent the brake disc from turning freely! In this case, carefully and evenly press the brake pads back slightly.

4. Release the parking brake so that the wheels and brake discs can turn freely.
5. Adjust the brake shoes on both rear wheels.

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   Adjustment device for brake shoes

   1. 5.1  Turn the relevant rear wheel with the opening to the adjustment device position.

      Information 

      The subsequent torque of the rear wheel must be greater than 100 Nm (74 ftlb.).

   2. 5.2  Using a screwdriver, adjust the adjustment device until the rear wheel can no longer be turned. > Adjustment device for brake shoes 

      Information 

      The rear wheels must turn freely.

   3. 5.3  Then, loosen by 14 (+/- 1) clicks of the adjustment device. > Adjustment device for brake shoes 

      Information 

      A calculated value in the positive range means: Turn adjustment device towards A - loosen.

      A calculated value in the negative range means: Turn adjustment device towards B - tighten.

6. Re-adjust the adjustment device in accordance with the instructions on > 9900 - PIWIS Tester 3  if necessary. > Adjustment device for brake shoes 

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   Adjustment device for brake shoes

   > Adjustment value 0.15 mm corresponds to 1 click on the adjustment device. 

7. Perform parking brake commissioning using > 9900 - PIWIS Tester 3  .
   1. 7.1 Select 'Control unit overview'  → 'Porsche Stability Management (PSM)' and press F12 to confirm. 
   2. 7.2 Select 'Maintenance/repairs'  → 'Parking brake commissioning' and start the procedure. 
8. Actuate the parking brake several times and check that the actuators open and close properly on both sides.
9. Position brake pads by pressing the brake several times.
10. Fit and tighten screw plug

    > Tightening torque 15 Nm (11.1 ftlb.) 

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    Screw plug for brake disc

11. Mount wheels.

    > Removing and installing wheel