PSM, an automatic vehicle stability control system designed to aid the driver in critical road scenarios, is fitted as standard. Sensors monitor the direction, speed, yaw velocity (speed of rotation around the vertical axis) and lateral acceleration of the car. Using this information, it is possible to calculate the actual direction of travel at any given moment. If the car begins to oversteer or understeer, PSM applies selective braking on individual wheels to restore stability and optimum speed. Whenever PSM is required to intervene, an indicator light in the cockpit flashes.

When accelerating on wet or other low-grip surfaces, PSM combines with PTM and uses the automatic brake differential (ABD) and anti-slip regulation (ASR) functions to maintain traction and stability. Included as standard equipment, PSM assists with high-precision inputs that enhance the

agility of each model. When ‘Sport’ mode is selected on the Sport Chrono Package Turbo with dynamic engine mount system, the PSM threshold is raised higher still to enable greater driver involvement – particularly at speeds of up to 44 mph.

PSM includes ABS to help minimize braking distances. System inputs are smooth and precise for greater driver comfort.

Active safety is further enhanced with the aid of two additional brake functions: electronic brake prefill and brake assist.

The prefill function is automatically enabled whenever the throttle pedal is suddenly released.

The pressure in the brake lines is marginally increased, bringing each of the pads into light contact with the corresponding disc. If the driver then decides to use the brakes, the system can apply the maximum force with virtually no delay.

The brake assist function, by contrast, is specifically designed for use in emergency stops. When the speed of brake pedal application and the pressure on the brake pedal exceed a predefined threshold, the hydraulics automatically apply the necessary pressure to achieve maximum deceleration.

For a more actively involved driving experience, PSM can be manually disabled. PSM remains present in the background and will only intervene under heavy braking where at least one front wheel

requires ABS assistance (in ‘Sport’ mode, if both front wheels require assistance). The automatic brake differential (ABD) remains active at all times.

The new 911 Turbo S models are equipped as standard with a braking system that has already proved it can withstand even the toughest racing conditions, such as those encountered in the Porsche Mobil 1 Supercup. That system is the Porsche Ceramic Composite Brake (PCCB). PCCB is available as an option for 911 Turbo models.

The ceramic discs have a diameter of 380 mm at the front and 350 mm at the rear. The discs are made from a specially treated carbon-fibre compound that is silicated in a high-vacuum process at 1,700 °C. The resulting material is not only much harder than metal, it is also more resistant to heat.

Even at high temperatures, the thermal resistance of the PCCB disc ensures excellent dimensional

stability. The ceramic material is totally resistant to corrosion and offers excellent acoustic damping properties.

The pads are mounted in six-piston monobloc aluminium fixed calipers at the front, with four-piston units at the rear. The resulting brake forces are both extremely high and remarkably consistent. The pedal response is fast and precise with only moderate input required.

PCCB enables shorter braking distances in even the toughest road and race conditions. Excellent fade resistance ensures greater balance when slowing from racetrack speeds.

The key advantage of PCCB is the total weight saving of approximately 50% over metal discs with

similar construction and dimensions. As well as enhancing performance and fuel economy, this represents a major reduction in both the unsprung and rotating masses. This, of course, produces additional benefits in terms of comfort and road-holding on uneven road surfaces as well as general handling and agility.

Please note that circuit racing, trackday use and other forms of performance driving can significantly reduce the service life of even the most durable pads and discs. As with conventional high-performance braking systems, we recommend that all brake components be professionally inspected and replaced where necessary after every track event.

The two full-size airbags can be inflated in two stages, depending on the severity of the impact. In a low-speed crash, the airbags are only partially inflated, thereby minimising discomfort to the occupants.

POSIP, fitted as standard, consists of side impact protection beams in the doors and two side airbags on each side, namely a thorax airbag located in the side of each backrest and a head airbag incorporated within each door. Each airbag has an approximate volume of 8 litres, ensuring excellent protection in the event of side impact.

Additional safety features include the headrests which form an integral part of each seat, an energy-absorbing steering column, three-point seat belts with height adjustment (Coupes only), seat belt pre-tensioners and force limiters and energy-absorbing elements in the dashboard.

On a 911 Turbo, there is one thing above all else that both the accelerator and brake pedals deliver when you press them – and that’s excitement.

The standard braking system of the 911 Turbo models features six-piston fixed calipers at the front and four-piston fixed calipers at the rear.

The red-painted calipers have a monobloc (one-piece) aluminium construction offering greater stability, better ‘bite’ characteristics under heavy braking and a further reduction in unsprung weight. The brakes are quick to apply and release, whilst the pedal travel is short and the bite point precise and consistent.

The front and rear discs have a generous diameter of 350 mm. All four discs are cross-drilled for better performance in the wet. The distinctive drill-hole pattern enables a faster response by allowing rapid dispersal of the water vapour generated under braking.

The discs are also internally vented for better heat dispersal. The result: excellent stability in all conditions. Cooling air is directed onto the brakes to further improve performance. A powerful 9-inch tandem brake booster unit enables easier pedal inputs.

Braking distances are further reduced with the aid of two functions in the standard Porsche Stability Management (PSM): electronic brake prefill and brake assist.

The new 911 Turbo S models come equipped with the Porsche Ceramic Composite Brake (PCCB) as standard.

The reinforced bodyshell contains a highly resilient passenger cell offering exceptional crash protection. At the front of the car, the cell is protected by a patented system of longitudinal and transverse members (1). In the event of an accident, it disperses the force of the impact and minimises deformation of the passenger cell. Additional features include an ultra-rigid bulkhead cross-member (2) made from super high-strength steel. This element is designed to absorb impact forces from the longitudinal members and thus protect the front footwells. The reinforced doors (3) also contribute to the overall rigidity of the car. An additional load path (4) is used to channel energy through the upper part of the shell and thus further protect the passenger cell.

In minor collisions, easily replaceable impact absorbers (5) protect the bodyshell.

An engine immobilizer with in-key transponder as well as a powerful alarm system featuring contact-sensitive exterior protection and radar-based interior surveillance are standard on all models.