Driver Support Automatic Braking

The driver support functions Adaptive Cruise Control* and Pilot Assist* have a special brake function in slow traffic and while stationary. In certain situations, the parking brake will be applied to keep the vehicle at a standstill.

Function for braking in slow traffic and at standstill

In slow-moving, stop-and-go traffic or when stopped at a traffic light, driving will resume automatically if the vehicle is stopped for less than approx. 3 seconds. If it takes more than 3 seconds for the vehicle ahead to begin moving again, the driver support function will go into standby mode and the auto-hold brake function will activate.

• The function can be reactivated by:
  • Pressing the button on the steering wheel keypad.
  • Pressing the accelerator pedal.
    • The function will resume following the vehicle ahead if it begins to move within approx. 6 seconds.

Deactivation of the auto-hold brake function

In certain situations, auto-hold will be deactivated when the vehicle is at a standstill and the function will go into standby mode. This means that the brakes will be released and the vehicle could begin to roll. The driver must actively apply the brakes to keep the vehicle stationary.

This may occur if:

• The driver depresses the brake pedal.
• The parking brake is applied.
• The gear selector is moved to the P, N or R position.
• The driver places adaptive cruise control or Pilot Assist in standby mode.

Automatic activation of the parking brake

The parking brake will be applied if the function is keeping the vehicle stationary using the brakes and:

• The driver opens the door or unfastens the seat belt.
• The function has held the vehicle in place for more than approx. 5 minutes.
• The brakes are overheating.
• The driver switches off the engine.

* Option/accessory.