TCS/ESP, detailed description: Function

A wheel speed sensor at each wheel provides the control module with information regarding wheel speed.

The ABS function (Anti Block System) allows the solenoid valves (inlet/outlet valves) and the pump the regulate the hydraulic brake pressure when retardation of one wheel is greater than that of the other wheels. The hydraulic brake pressure can be kept constant or can be reduced in order for each wheel to employ maximum brake power for the road surface.

EBD (Electronic Brake-force Distribution) allows the control module to regulate brake force distribution between the front and rear wheels with help from solenoid valves (inlet/outlet valves). The pump is not active during EBD modulation.

TCS (Traction Control System) function allows the control module to make maximum use of friction for the driving wheels during acceleration. A limited wheelspin can be adjusted with brake application and a request to the ECM for engine torque limitation. The control module activates the pressure increase valve, pressure relief valve and the pump in order to create and adjust pressure to the drive wheel for which the brake is applied when wheel spin exceeds the accepted limit.

When the ignition key is turned to the ON position, the control module is activated, the ABS lamp and TCS OFF/ESP ON symbols in the MIU with a fixed glow during function check. The lamps extinguish after 3-5 seconds if no faults are found.