To do any work on the rear brakes you need retract the parking brake by entering the emergency brake service mode. Here's the procedure taken from JRL workshop manual. I have standard brakes fitted, I don't know if the procedure is the same for Brembo?
This procedure requires the vehicle in the Park or Neutral position, with the ignition turned ON (the engine must be OFF) and the parking brake system in Service Mode.
Once the rear brake pads or brake discs have been installed, the Service Mode must be cancelled.
Activate service mode:
1. Press and hold the parking brake switch in the release position.
2. Wait 2 seconds.
3. Press and hold the accelerator pedal in the wide open throttle position.
4. Wait 2 seconds.
5. Turn the ignition Off and back On immediately.
(An audible noise will be heard to confirm that the parking brake has been released in Service Mode.)
6. Release the accelerator pedal and release the parking brake switch to the neutral position.
Deactivate service mode:
1. Press and hold the parking brake switch in the apply position.
2. Wait 2 seconds.
3. Press and hold the accelerator pedal in the wide open throttle position.
4. Wait 2 seconds.
5. Turn the ignition Off and back On immediately.
(An audible noise will be heard to confirm that the parking brake has been released from the Service Mode.)
6. Release the accelerator pedal and release the parking brake switch to the neutral position.
This procedure requires the vehicle in the Park or Neutral position, with the ignition turned ON (the engine must be OFF) and the parking brake system in Service Mode.
Once the rear brake pads or brake discs have been installed, the Service Mode must be cancelled.
Activate service mode:
1. Press and hold the parking brake switch in the release position.
2. Wait 2 seconds.
3. Press and hold the accelerator pedal in the wide open throttle position.
4. Wait 2 seconds.
5. Turn the ignition Off and back On immediately.
(An audible noise will be heard to confirm that the parking brake has been released in Service Mode.)
6. Release the accelerator pedal and release the parking brake switch to the neutral position.
Deactivate service mode:
1. Press and hold the parking brake switch in the apply position.
2. Wait 2 seconds.
3. Press and hold the accelerator pedal in the wide open throttle position.
4. Wait 2 seconds.
5. Turn the ignition Off and back On immediately.
(An audible noise will be heard to confirm that the parking brake has been released from the Service Mode.)
6. Release the accelerator pedal and release the parking brake switch to the neutral position.
