Wear Limits

WM 4600TW Technical data/Brake wear limit

















Technical data - Boxster S/Cayman S
Operating brake (foot brake):
^ Dual-circuit brake system with brake-circuit division per axle.
^ Internally ventilated and perforated grey cast iron brake discs on front and rear axle.
^ Four-piston monobloc calliper on front and rear axle.
^ The brake callipers are painted red for visual differentiation.
^ Standard Porsche Stability Management (PSM 8.0).





Test values/wear limits - Boxster S/Cayman S

Note
Depending on the wear of cast iron brake discs, two condition criteria can make replacement necessary:
^ Cracking in the holed (perforated) brake disc friction plates is in an advanced state.
^ Minimum brake disc thickness is not retained due to wear (material erosion due to friction).








Information on machining cast-iron brake discs

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!

Technical data for Boxster S/Cayman S - PCCB brakes (option)
Operating brake (foot brake):
^ Dual-circuit brake system with brake-circuit division per axle.
^ Internally ventilated and perforated PCCB brake discs on front and rear axle.
^ Six-piston monobloc calliper on front axle and four-piston monobloc calliper on rear axle.
^ The brake callipers are painted yellow for visual differentiation.
^ Standard Porsche Stability Management (PSM 8.0).





Test values/wear limits for Boxster S/Cayman S - PCCB brakes

Note
The following condition criteria can make replacement necessary depending on the wear of the PCCB brake discs:
^ Surface changes in the brake disc friction surfaces at an advanced stage.
^ Minimum brake disc thickness is not retained due to wear (material erosion due to friction).