Electronic Brake Prefill
WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.
Electronic brake prefill senses any rapid throttle lift off, activating a small brake hydraulic pressure build-up of approximately 3 to 5 bar (43.5 to 72.5 lbf/in2 ) in anticipation of the brakes being applied.
This application produces a quicker brake pedal response and consequently slightly shorter stopping distances. The system supports vehicles with adaptive speed control.
When the ABS control module detects rapid throttle lift off (signal received from the ECM over the high speed CAN bus), it controls the ABS Hydraulic Control Unit (HCU) to apply a low brake pressure to assist in a quicker brake application.