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

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IMPORTANT: Always precision-turn both sides of both brake discs on one axle.
Maximum machining dimension per friction ring side is 0.8 mm!
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) .

Stationary brake disc lathe:

IMPORTANT: Only BMW-approved BRAKE LATHE B345 BMW may be used.

In the case of stationary brake disc lathes, the BRAKE DISC must be removed.

Please refer to the equipment manufacturer's operating instructions 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 mobile brake disc lathe may be used.

Fig 2: Identifying Mobile Brake Disc Lathe

Courtesy of BMW OF NORTH AMERICA, INC.

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 vehicle.

Please refer to the equipment manufacturer's operating instructions for the exact procedure.

After fine-grinding the brake discs, measure the thickness difference inside the braking surfaces at 8 points with an caliper gauge.

Fig 3: Measuring Brake Surface Thickness Using Micrometer Gauge

Courtesy of BMW OF NORTH AMERICA, INC.