Check Actuator Travel Of Brake Shoes
Information
The actuator travel of the parking-brake shoes only needs to be checked for brake discs with an aluminum brake hub. Aluminum brake hubs are installed on the following brakes:
- PCCB
Information
The terms "Ignition on" and "Starting engine" are re-defined for fully electric vehicles (battery electric vehicles - BEV).
Establishing operational readiness/Ignition on:
Prerequisites for establishing operational readiness: High-voltage battery is sufficiently charged, remove vehicle charging cable from the vehicle charge port, put driver's key in the emergency start tray.
Establishing operational readiness automatically: Get into the vehicle and close the driver's door. The driver's key is recognized inside the vehicle. Operational readiness is established.
Establishing operational readiness manually: Press Start/Stop switch. The driver's key is recognized inside the vehicle. Operational readiness is established.
Establishing operational readiness/Starting engine:
Establish operational readiness and engage transmission range. The vehicle is now ready to drive and can be moved.
Ending operational readiness/Switching off ignition
Ending operational readiness automatically: Get out of the vehicle with the driver's key and close the driver door. The driver's key is no longer detected outside the vehicle. Operational readiness ends.
Ending operational readiness manually: Press Start/Stop switch until the instrument cluster is switched off.
Ending driving readiness/Stopping engine
Vehicle is stationary: Press the P button on the instrument cluster. The vehicle is parked.
Information
- When operational readiness is established, the electric parking brake is closed .
- When driving readiness is established, the electric parking brake is open .
- Close electric parking brake.
- Read out left and right actuator position.
- 2.1 Connect the PIWIS Tester to the vehicle and switch on the PIWIS Tester .
- 2.2 Establish operational readiness.
- 2.3 Start diagnostics.
- 2.4 Select "Brake electronics (PSM)" control unit.
- 2.5 Select the "Actual values/input signals" tab.
- 2.6 Select "Parking brake/actuators" menu item and press F12 to continue.
- 2.7 Select the sub-procedure "Left actuator position and right actuator position" and press F12 to continue.
- 2.8 Follow the instructions on the Tester.
- If the value is greater than: > Length 4.5 mm , the actuator must be calibrated.