Necessary preliminary work:
Release connector (1) and remove.
Slacken nut (2).
Disconnect positive battery cable from alternator.
Slacken nut (1).
Remove cover from idler pulley and undo bolt (1) beneath it.
Remove idler pulley.
Release screws (1).
Feed out alternator upwards and remove.
NOTE: Check stored fault messages.
Delete fault memory.
BMW X3 Service & Repair Manual > Parking brake: Electromechanical parking brake - emergency release
Necessary preliminary tasks:
Remove EMF ACTUATORS on left and right.
IMPORTANT: Secure vehicle against rolling, e.g. with chocks.
Using an 7 mm WAF hexagon socket wrench (1), turn back brake caliper spindle in clockwise direction.
Turn back until wheel can turn freely.
IMPORTANT: ...