A Ready Alert Braking (RAB) system anticipates when the driver might be about to make a sudden stop and prepares the brakes in case they are required.

The system works by sensing when the driver lifts their foot off the accelerator abrubtly and responds by gently pressing the brake pads against the brake disc to prepare for heavy braking.

This means that the car is ready to start braking even before the driver has had a chance to move their foot over to the brake pedal, which increases the ability for the driver to stop quickly.