Mobile brake disc lathe

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

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.

Refer to the equipment manufacturer's instruction manual for the exact procedure.

Fig 1: Identifying Mobile Brake Disc Lathes

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 caliper gauge.

Fig 2: Checking Thickness Difference Using Micrometer Gauge

Courtesy of BMW OF NORTH AMERICA, INC.