Technical Data For 911 C2/C4 and 911 C2S/C4S - PCCB Brakes (Option)

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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 fixed calliper on front axle and four-piston fixed calliper on rear axle
The brake callipers are painted yellow for visual differentiation
Standard Porsche Stability Management (PSM 9.0)

Location	Description	Type	Basic value
Brake booster diameter (vacuum)	C2/C2S/C4/C4S	Tandem/diameter	8/9 Zoll
Brake booster transmission ratio (i)	C2/C2S/C4/C4S	Factor	5.5
Diameter of brake master cylinder, front/rear	C2/C2S/C4/C4S	Diameter	26.99/26.99 mm
Brake master cylinder stroke, front/rear	C2/C2S/C4/C4S	Measured value	24.0/12.0 mm
Brake disc diameter, front	C2/C2S/C4/C4S	Diameter	350 mm
Brake disc diameter, rear	C2/C2S/C4/C4S	Diameter	350 mm
Effective brake disc diameter, front	C2/C2S/C4/C4S	Diameter	286.6 mm
Effective brake disc diameter, rear	C2/C2S/C4/C4S	Diameter	294 mm
Piston diameter in six-piston brake calliper, front	C2/C2S/C4/C4S	Diameter	2 x 34 mm
Piston diameter in six-piston brake calliper, front	C2/C2S/C4/C4S	Diameter	2 x 32 mm
Piston diameter in six-piston brake calliper, front	C2/C2S/C4/C4S	Diameter	2 x 30 mm
Piston diameter in four-piston brake calliper, rear	C2/C2S/C4/C4S	Diameter	4 x 32 mm
Effective brake pad area, front	C2/C2S/C4/C4S	Area	424 cm²
Effective brake pad area, rear	C2/C2S/C4/C4S	Area	252 cm²
Total brake pad area	C2/C2S/C4/C4S	Area	676 cm²