C o m p l e t e  9 6 4

Brakes

The 964 Carrera 4 and Carrera 2 maintained different branking systems out of necessity. The four wheel drive mechanism in the Carrera 4 was linked via the same hydraulic pump system to the brakes system which incorporated a Bosch ABS anti-lock system. Note that the four wheel drive mechanism and brake system functioned together in order to control such vices as lift off oversteer in the Carrera 4 model (a more detailed write up on this particular aspect is in the process of being written up).

Basically, the two front wheels were individually controlled by two brake sensors of the ABS system whilst the rear wheels operated such that if one wheel began to lock, both wheels would be released at the same time thus alleviating any instability.

Discs on the Carrera 4 comprised four vented discs (298/299mm diameter, 28mm thick front and 24mm thick rear) controlled by four piston calipers all round. In it's time, it was possibly one of the best braking systems available on any production car.

By comparison, the Carrera 2 operated on a more conventional vacuum servo that was located where the front differential in the Carrera 4 was situated. Furthermore, prior to 1992, the Carrera 2 utilised two piston rear calipers (which were replaced by the four piston Carrera 4 calipers only in 1992).

For the Turbo model, brakes were further uprated with 322mm diameter/32mm thick front discs and 299mm diameter/28mm thick rear discs. Larger calipers were also utilised to hold larger brake pads. All this amounted to a phenomenal braking performance of 35.6 meters from a speed of 100kph. Note that these brakes were easily retrofitted to both the Carrera 4 and 2 models.

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Original calipers on 964 Carrera 4