Fading Brake Support (Fbs)

Fading Brake Support (FBS)
If the driver is unable to make use himself of full vehicle deceleration on account of poor brake pad friction coefficients, e.g. due to high thermal loads, he is supported by the FBS function. The requirement is a high braking pressure with a simultaneously low vehicle deceleration and high brake disc temperature.
The FBS function compensates for the brake force loss through an increase in temperature.
The diminishing braking effect when brakes are hot requires the driver to press the brake pedal more firmly. This increase in pressure is now assumed by an activation of the hydraulic pump.
The brake-disc temperature is not measured but rather calculated by means of the following input variables:
^ Wheel speed
^ Individual wheel brake pressure
^ Ambient temperature
^ Number of brake applications over time