3411667 Precision-turning both front brake discs on both sides

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IMPORTANT: Always precision-turn both sides of both brake discs on one axle.
Observe minimum brake disc thickness (MIN TH). See Max. machining dimension per friction ring side in FRONT BRAKE .

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 See 3411220 REMOVING AND INSTALLING/REPLACING BOTH FRONT BRAKE DISCS (BREMBO) or 3411220 REMOVING AND INSTALLING OR REPLACING BOTH FRONT BRAKE DISCS .

Please refer to the lathe manufacturer's instruction manual for the exact procedure.

Fig 1: Identifying Stationary Brake Disc Lathe

Courtesy of BMW OF NORTH AMERICA, INC.

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 See 3411520 REMOVING AND INSTALLING/REPLACING FRONT LEFT OR RIGHT BRAKE CALIPER (BREMBO) or 3411020 REMOVING AND INSTALLING OR REPLACING FRONT LEFT OR RIGHT BRAKE CALIPER (TEVES) 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.

Fig 2: Identifying Mobile Brake Disc Lathe

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. See FRONT BRAKE .

Fig 3: Measuring Brake Surface Thickness Using Micrometer

Courtesy of BMW OF NORTH AMERICA, INC.