34 21 947 Precision-turning both rear brake discs on both sides
WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. 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). See BRAKES - TECHNICAL DATA .
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). See BRAKES - TECHNICAL DATA .
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 lathe manufacturer's instruction manual 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 car.
Please refer to the lathe manufacturer's instruction manual for the exact procedure.
After fine-grinding the brake discs, measure the thickness difference inside the braking surfaces at 8 points with an external micrometer.