34 21 947 Precision-turning both rear brake discs on both sides
WARNING: This page is about a different car, the 2007 BMW 550i, 2006 BMW 550i, 2005 BMW 545i, and 2004 BMW 545i. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Always fine-grind both sides of both brake discs on one axle. Observe Max. machining dimension per friction ring side. Refer to BRAKES - TECHNICAL DATA - E60
. Minimum brake disc thickness (MIN TH). Refer to BRAKES - TECHNICAL DATA - E60
. Brake discs of M models (Compound brake discs) must not
be machined! Only one brake lining set may be used up on brake discs which have been lathe-turned to minimum thickness (MIN TH). Only one brake pad set may be used up on brake discs which have been lathe-turned to minimum thickness (MIN TH). Refer to BRAKES - TECHNICAL DATA - E60
.
Stationary Brake Disc Lathe:
In the case of stationary brake disc lathes, the brake disc must be removed. Refer to 34 21 320 REMOVING AND INSTALLING OR REPLACING BOTH REAR BRAKE DISCS .
Please refer to the lathe manufacturer's instruction manual for the exact procedure.
IMPORTANT:
Only BMW-approved brake disc lathes may be used!
Courtesy of BMW OF NORTH AMERICA, INC.
Mobile Brake Disc Lathe:
In the case of mobile brake disc lathes, only the brake caliper has must be removed. Refer to 34 21 745 REMOVING AND INSTALLING OR REPLACING LEFT OR RIGHT REAR BRAKE CALIPER .
The brake discs remain on the car.
Please refer to the lathe manufacturer's instruction manual for the exact procedure.
IMPORTANT:
Only BMW-approved brake disc lathes may be used!
Courtesy of BMW OF NORTH AMERICA, INC.
After fine-grinding the brake discs, measure the thickness difference inside the braking surfaces at 8 points with an external micrometer. Refer to BRAKES - TECHNICAL DATA - E60
.
Courtesy of BMW OF NORTH AMERICA, INC.