Information On Machining Grey Cast-Iron Brake Discs

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2012 Porsche Cayman, 2012 Porsche Boxster, 2011 Porsche Cayman, 2011 Porsche Boxster, and 2010 Porsche Cayman. However, it is still accessible from the selected car via links, so may be relevant.

Possible complaints

Damage due to lack of use (rusting). This causes vibrations in the steering wheel, noises and brake pedal pulsation.
Brake disc becomes distorted as a result of serious driving, e.g. on a racing circuit.
Too much lateral runout when new brake discs are fitted on dirty or distorted wheel hubs.

Procedure

Check brake disc for cracks, minimum thickness, lateral runout, thickness tolerance, flatness and surface roughness.
If necessary, (depending on the actual brake disc thickness and the brake disc wear limit) machine the brake disc using one of the disc brake dressing machines approved by Porsche.
The brake disc must only be reworked symmetrically, i.e. equally from both sides! Observe the operating instructions for the disc brake dressing machine!