Porsche 996 TT, Repair Manual

Page: 360 / 2099

possibility for TC, FZR and MSR.
2) **
EBV = electronic brake distributor (brake proportioning control). As a result, no screw−in brake
proportioning valves are required!
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Wear limit technical data − Turbo with cast iron brake discs
Depending on the wear of cast iron brake discs, two condition criteria can make replacement necessary:
1. Cracking in the holed (perforated) brake disc friction plates is in an advanced state.
2. Brake disc minimum thickness is not attained due to wear (material erosion due to friction).
Designation Note, dimensions Wear limit
Pad thickness front approx. 12.0 mm 2 mm
rear approx. 12.0 mm 2 mm
Brake disc thickness, new front
rear 34 mm
28 mm
Minimum brake disc thickness
after machining
* 1)
front
rear 32.6 mm
* 1)
26.6 mm
* 1)
Brake disc wear limit front
rear 32.0 mm
26.0 mm
Peak−to−valley surface roughness
of the brake disc after machining, max. 0.006 mm
Thickness tolerance of the brake discs, max. 0.02 mm
Lateral runout of the brake disc, max. 0.03 mm
Lateral runout of the wheel hub, max. 0.03 mm
Lateral runout of the brake disc when installed, max. 0.06 mm
Pushrod play (measured at the brake pedal plate) approx. 1 mm
Parking brake
(handbrake) Drum brake acting mechanically on
both rear wheels
Parking brake drum 180 mm 181 mm
Brake shoe width 25 mm
Brake pad thickness 4.5 mm 2 mm
1) *
The brake disc must only be reworked symmetrically, i.e. from both sides evenly.
996420, 996421, 996450, 996451, 996620, 996621, 996650, 996651
einordnung
Technical data − Turbo with cast iron brake discs 297