BMW X3 Service & Repair Manual > Front brakes: Removing and installing/replacing left or right front brake caliper
Necessary preliminary tasks:
REMOVE WHEEL .
Read and comply with GENERAL INFORMATION.
After completing repair work: BLEED BRAKE SYSTEM.
Press brake pedal down to floor and secure with pedal support.
NOTE:
The pedal support may only be released when the brake lines are reconnected. ...