Technical data

Designation

Observations, dimensions 911 Carrera 4

Wear limit 911 Carrera 4

Operating brakes

Hydraulic dual-circuit brake system with front

(foot brake)

axle/rear axle circuit division. Hydraulic

brake booster, internally vented and drilled brake

discs with four-piston fixed calipers on front and

rear axles. ABS / ABD fittec

I as standard.

Brake booster

Hydraulic

Boost factor

4.8

Brake master cylinder

front dia.

25.4 mm

rear dia.

25.4 mm

stroke

17/15 mm

Proportioning valve

Switchover pressure reducing factor

45 bar - 0.46

Brake disc diameter

front

304 mm

rear

299 mm

Effective brake disc diameter

front

251 mm

rear

246 mm

Piston diameter in caliper

front

2 x 44 + 2 x 36 mm

rear

2 x 30 + 2 x 28 mm

;

Brake pad area

front

250 cm2

Z-

rear

172 cm2

Total brake pad area

422 cm2

Pad thickness

front

approx. 11.0 mm

2 mm

rear

approx. 12.0 mm

2 mm

The brake disc must only be machined symmetrically, i.e. by an identical amount on both sides.

Technical data

Germany - 7, 1994

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