The dimensions of the ABS brake system have been largely taken over from the 911 Carrera.

The increased driving performance and additional weight are the reasons why it was not possible to simply take over the brake system from the basic model. According to the Porsche philosophy, the brake system must always provide active safety potential at several times the engine performance.

The integration of racing technology in road vehicles, combined with a continual further development of the braking system, have led to today's Porsche sports cars being fitted with the best brakes in the world. The new Boxster S impressively continues this tradition. The criteria for the design of the brake system were selected according to the arising running loads, whereby not only were the applicable national regulations taken into consideration, but also the loads during mountain driving, low load operation (town traffic) and forced motorway driving.

The firmness of the Porsche braking system is particularly impressive. it satisfies brake test conditions such as the Porsche fading test, recognised as the hardest test in the industry.

This test, consisting of 25 braking manoeuvres - immediately one after the other- from 90% of top speed to 100 km/h with a constant deceleration of 0.8g, can only be completed if all components such as cooling air ducts, wheel braking systems, wheels and the anti- blocking system are carefully matched. Pure "from 100 to 0" braking does not represent the main criterium for assessing the performance of a vehicle braking system at all.

The result of this Porsche brake system philosophy are braking deceleration values, which exceed the vehicle acceleration values by far.

The disc-brake callipers of the new Boxster S have been painted red for reasons of optical differentiation and enhancement. In addition to this, the brake discs are also perforated, which complies with the response behaviour particularly when braking in wet conditions. This effectively eliminates the film of water which builds up between the disc and lining.

Basic technical data of the wheel braking system, values for the Boxster in brackets:

The thermally dynamic balance of the entire braking system is supported by aero-dynamic measures. An important role is played by objectively introducing fresh air through air channels in the front of the vehicle and the heat dissipation through the alloy metal wheels. The best solution aerodynamically, i.e. minimum aero-dynamic lift at maximum cooling air through-flow, is achieved by the so-called underbody airflow.

The cooling air for the front axle brake is directed through an air channel underneath the nose and a deflector plate on the lower control arm over the opened brake guard and straight to the brake disc. The position of the disc-brake callipers behind the middle of the wheel means that the airflow can freely cool the brake disc. The wheels on the other hand are so designed that the heated air is dissipated at high speeds, and during braked slow driving, for example in the mountains, as much warmth is radiated as possible.

The wheel braking system concept for the new Boxster S is a consistent further development of the proven, race-tried Porsche four-piston calliper principle made of aluminium. The familiar advantages, such as the high degree of component rigidity, optimum heat dissipation and reliability, could once again be increased.

The monobloc concept patented by Porsche is not only beneficial due to the low volume consumption with regards to brake pedal travel and regulating precision, but it also further reduces the component weight on the front and rear axles by approx. 21% compared to the earlier Porsche aluminium four-piston callipers, and there fore also contributes to reducing the unsprung mass.