34 21 947 Precision-turning both rear brake discs on both sides
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. 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.
Maximum machining dimension per friction ring side is 0.8 mm!
Observe 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).
Maximum machining dimension per friction ring side is 0.8 mm!
Observe 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.
Mobile brake disc lathe:
IMPORTANT:
Only BMW-approved brake disc lathes may be used!
In the case of mobile brake disc lathes, the brake calipers and brake anchor plates must be removed.
The brake discs remain on the vehicle.
After fine-grinding the brake discs, measure the THICKNESS DIFFERENCE inside the braking surfaces at 8 points with an external caliper gauge.