34 11 667 Precision-turning both front brake discs on both sides

IMPORTANT: Always precision-turn both sides of both brake discs on one axle.

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:

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.

IMPORTANT: Only BMW-approved brake disc lathes may be used!

Fig 1: Identifying Stationary Brake Disc Lathe

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.

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!

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.

Fig 3: Measuring Brake Discs Thickness

Courtesy of BMW OF NORTH AMERICA, INC.