Modulation continues until:

• The friction between wheels and road surface changes so that wheelspin does not exceed the limit.
• The driver brakes (brake lights switch input active).
• Modulation is interrupted due to the risk for overheating the brakes.

When modulation is interrupted, the control module stops the pump, closes the pressure increase valve and opens the pressure relief valve, i.e. the valves and the return pump resume their rest positions.

If TCS modulation is interrupted by the driver braking, TCS modulation with braking will be disengaged and the braking function will be chosen instead. Any delay that may then arise will not affect the braking function since the brake fluid can flow through the check valve which is mounted parallel with the pressure relief valve.

Interruption of TCS modulation with braking due to a risk for overheating the brakes occurs as a result of continuous recording of the aggregate duration of TCS modulation with braking over a certain period of time by the control module.

The time is compared with a pre-programmed maximum value and modulation with braking is disengaged when this is exceeded.