34 11 667 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 Max. machining dimension per friction ring side, see 34 11 FRONT BRAKE E83 .

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:

In the case of stationary brake disc lathes, the brake disc must be removed, see 34 11 220 Removing and installing/replacing both front 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!

Fig 1: 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 must be removed, see 34 11 519 Removing and installing/replacing left or right front 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!

Fig 2: 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 34 11 FRONT BRAKE E83 .

Fig 3: Measuring Brake Discs Thickness

Courtesy of BMW OF NORTH AMERICA, INC.