34 21 947 Precision-Turning Both Rear Brake Discs On Both Sides
WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Always precision-turn both sides of both brake discs on one axle.
Observe MAX. MACHINING DIMENSION PER FRICTION RING SIDE
MINIMUM BRAKE DISC THICKNESS (MIN TH)
Brake discs of M models (Compound brake discs) must not be machined!
Only one brake pad set may be used up on brake discs which have been lathe-turned to MINIMUM THICKNESS (MIN TH) .
Observe MAX. MACHINING DIMENSION PER FRICTION RING SIDE
MINIMUM BRAKE DISC THICKNESS (MIN TH)
Brake discs of M models (Compound brake discs) must not be machined!
Only one brake pad set may be used up on brake discs which have been lathe-turned to MINIMUM THICKNESS (MIN TH) .
Stationary brake disc lathe:
IMPORTANT:
Only BMW-approved brake disc lathes may be used!
In the case of stationary brake disc lathes, the BRAKE DISC MUST BE REMOVED .
Please refer to the equipment manufacturer's operating instructions for the exact procedure.
Mobile brake disc lathe:
IMPORTANT:
Only BMW-approved brake disc lathes may be used!
In the case of mobile brake disc lathes, the BRAKE CALIPER and the brake anchor plate must be removed.
The brake discs remain on the vehicle.
Please refer to the equipment manufacturer's operating instructions for the exact procedure.
After fine-grinding the brake discs, measure the THICKNESS DIFFERENCE inside the braking surfaces at 8 points with an caliper gauge.