It is only necessary to rewax or seal the affected area after repairing the body.
Only BMW approved products may be used to comply with the six year warranty against rust perforation.
These products protect cavities effectively and permanently against corrosion. Their excellent coating and waterproofing properties let them flow into all inaccessible corners and folds for unsurpassed overall protection.
UNDERBODY AND BODY CAVITY SEALING COMPOUND
For sealing of body cavities, such as doors, Apillars,
front, side and cross members, etc.
(Former BMW Part No. 81 22 9 407 479)
3M Part No. 8891
Wurth Part No. 892080
Also: Wurth "Brushable Seam Sealer", Part No. 8901021.
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. ...