Parking Brake Actuator: Service and Repair
WM 468519 Removing and installing spreader device (EPB)
Preliminary work
Preliminary work for removing and installing spreader device (EPB)
1. Remove the wheel. -> 440519 Removing and installing wheel - section on "Removing" Removal and Replacement
2. Move electric parking brake (EPB) into ]]installation position[[ using the Porsche System Tester. To do this, select ]]Parking brake[[ in the control unit overview. Select ]]Drive link tests [All] Move to installation position[[.
3. Remove brake caliper and hang it at a suitable place in the wheel arch. -> 474119 Removing and installing rear brake caliper - section on "Removing" 474119 Removing and installing rear brake calliper
4. Remove brake disc. -> 465419 Removing and installing rear brake disc (PCCB) - section on "Removing" 465419 Removing and Installing Rear PCCB Brake Disc
5. Remove brake shoes. -> 468356 Replacing brake shoes - section on "Removing" Removal and Replacement
Removing spreader device (EPB)
Information
- The pictures shown in this document may differ from the original.
- However, this does not affect the validity and relevance of the pictures.
The spreader device (actuator) is located on the rear-axle wheel bearing housing instead of the mechanical spreader device with the parking-brake cable.
EPB actuator (shown as an example in illustration)
1. Release electric plug connection -2- at the actuator -1- ( -a- ) and pull it off -A-.
Plug connection for actuator
2. Unclip wire harness -4- from the retaining clip -3-.
3. If the actuator -1- has to be reused, secure it in the brake shoe mountings with a tie-wrap -2- to prevent it from twisting!
Securing actuator to prevent it from twisting (shown as an example in illustration)
4. Remove the fastening screws on the actuator -arrows-.
Fastening screws on actuator (shown as an example in illustration)
5. Loosen fastening screws -1- on the brake cover plate.
Screws on brake cover plate
6. Turn the brake cover plate so that the actuator can be removed -arrow-.
Removing actuator (shown as an example in illustration)
Installing spreader device (EPB)
Information
If new brake discs and/or new brake shoes are installed on the vehicle, they must be worn in before calibration (not PCCB!). -> 468350 Reworking parking-brake shoes Procedures
If a new actuator was installed, it must be confirmed in the Porsche System Tester.
- ]]Control unit overview [Parking brake] Drive links/Tests[[]]Confirm actuator replacement[[.
1. Note: Do not twist the brake shoe mountings when installing the actuator!
2. If using the same actuator again:
2.1. Clean the spreader device carefully so as not to damage the dust boots.
2.2. Visually inspect the dust boots for cracks.
3. Tighten fastening screws on the spreader device to the specified tightening torque. -> 4X00IN Tightening torques for brake mechanics 4X00IN Tightening torques for brake mechanics
Fastening screws on actuator (shown as an example in illustration)
4. Tighten fastening screws on the brake cover plate to the specified tightening torque. -> 4X00IN Tightening torques for rear axle 4X00IN Tightening torques for rear axle
Screws on brake cover plate
5. Plug in electric plug connection -2- for the actuator -1- ( -A- ) and lock it -a-.
Installing plug connection
6. Clip wire harness -4- into the retaining clip -3- ( -B- ).
Subsequent work
Subsequent work for removing and installing spreader device (EPB)
Information
If new brake discs and/or new brake shoes are installed on the vehicle, they must be worn in before calibration (not PCCB!). -> 468350 Reworking parking-brake shoes Procedures
If a new actuator was installed, it must be confirmed in the Porsche System Tester.
- ]]Control unit overview [Parking brake] Drive links/Tests[[]]Confirm actuator replacement[[.
1. Install brake shoes. -> 468356 Replacing brake shoes - section on "Installing" Removal and Replacement
2. Fit the brake caliper. -> 474119 Removing and installing rear brake caliper - section on "Installing" 474119 Removing and installing rear brake calliper
3. Fit wheel. -> 440519 Removing and installing wheel - section on "Installing" Removal and Replacement
4. Adjust, grind down and calibrate the electric parking brake (EPB) using the Porsche System Tester.-> 468316 Adjusting parking-brake shoes Adjustments-> 468315 Adjusting and calibrating brakes - section on "Installing" Adjustments