The electromechanical parkingbrake is integrated in the rear wheel brake caliper. The electrical signal is transfered to a mechanical movement by a step motor and a multistage gear device to press the brakepads against the brake disc. When service is performed on the rear wheel brakes it is necessary to open the parkingbrake and release the brakepads by moveing the brake pistons backwards with a diagnostic instrument. After service is performed the parking brake must be applyed with a diagnostic instrument, and the brakepads new position is automatically stored.
Observe:
It is necessary to reset the brake pistons when following operation is performed:
Disassembling and refitting of parking motors.
Changing of brakepads.
Disassembling and refitting of brake caliper.
Disassembling and refitting of brake discs.
Disassembling and refitting of wheel hub.
After service is performed and the parking brake is adjusted the fault code: 1087 basic setting not performed is stored in the fault memory. The fault code 473 Electromechanical parking brake control unit; basic setting not performed is also stored in the ABS control unit. In connection to this must a basic setting of the brake system be performed.
Test prerequisites:
Ignition on and engine off.
Battery voltage OK.
Parking brake not applyed.
Performance:
Resetting of pistons (before service)
Choose function: Resetting of pistons (before service)
Confirm with OK.
The pistons is now driven backwards by the step motors.
Move pistons forward (after service)
Choose function: Move pistons forward (after service).
Confirm with OK.
The step motors moves the pistons forward.
Exit the function.
Turn off the ignition for 5 seconds and turn it on again.
The elektromechanical parking brake check lamp is flashing.
Press the brake pedal and hold. Press simultaneously at the elektromechanical parking brake button. (the lamp shall now go out)
Performe the basic setting: Basic setting of brake system.