Normal Braking - Pressure Build

The ABS control module constantly monitors and compares the wheel speed sensor signals. When all four signals are at the same frequency within a small window of tolerance, the ABS system is not active and normal braking takes place.

The inlet solenoid valves of the hydraulic unit are deenergized. This maintains an open passage from the master cylinder to the brake calipers.

The outlet solenoids are also de-energized. This maintains a closed outlet of the brake circuit back to the master cylinder reservoir.

The inactive scenario is equal to a conventional braking system where the driver applies hydraulic pressure from the brake pedal and the brake calipers react by compressing the brake pads on the rotor.