Wear Limits

Technical data/test values and brake wear limits








Technical Values





Test values/wear limits for Cayenne 17" brake system (V6)

Information:
Depending on the extent of wear on cast iron brake discs, two condition criteria can make replacement necessary:
^ Formation of cracks at advanced stage on the brake disc friction surfaces.
^ Minimum brake disc thickness is not retained due to wear (material erosion due to friction).





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.
^ 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. evenly from both sides! Observe the operating instructions for the disc brake dressing machine!