Information On PSM

The vehicles are equipped with a new PSM generation with enhanced functions, which considerably improve active safety.

• Enhanced braking readiness
• Brake assist function
• Enhanced Trailer Stability Management
• New ABS tuning for braking on loose surfaces

With enhanced braking readiness, the brake system builds up slight pressure when the accelerator is released quickly and places the brake pads lightly on the brake discs. If the driver now presses the brake, braking power can be achieved more quickly. This results in a shorter stopping distance. Enhanced braking readiness always remains active, irrespective of whether PSM is on or off.

On identifying full braking - when a defined pedal pressure is exceeded - brake assist supplies the required pressure for maximum deceleration via the PSM hydraulic unit. Brake assist can be deactivated by switching off PSM.

Enhanced Trailer Stability Management is a support function of PSM for driving with a trailer. The system detects swaying movements of the trailer and tries to minimize these through targeted braking. Trailer Stability Management can be switched off by switching off PSM. When the driver presses the brake pedal, Trailer Stability Management is activated even if PSM is switched off.

The ABS control strategy has been modified for braking on loose surfaces. A brake barrier, which helps to reduce braking distance on gravel or snow for example, is created in front of the tires by blocking the wheels short.