Electronic Brake Control Module: Description and Operation

ABS control module





The control module contains two different micro-processors which receive signals from different sensors in the system. The microprocessors operate in parallel and use a program to compute the necessary ABS and electronic brake force distribution functions. The ABS control module has eight valve coils for the hydraulic valves, four outlet valves and four inlet valves.

The control module has a connector for connection to the car wiring.

Control module for STC (stability and traction control), DSTC (dynamic stability and traction control), and TRACS (traction control system)





The control module for STC/DSTC/TRACS has twelve valve coils for the hydraulic valves; four are outlet valve coils, four are inlet valve coils and four are used for stability and traction control. When replacing Brake Control Module (BCM) with DSTC, the control module must be calibrated according to the instructions in VADIS vehicle communication or by a special test drive (see test drive schedule DSTC/BCM, description).

ABS hydraulic modulator





The hydraulic modulator is available in three versions; ABS, STC (stability and traction control) and DSTC (dynamic stability and traction control)/TRACS (traction control system). The ABS hydraulic modulator is located in the engine compartment. The ABS hydraulic modulator consists of hydraulic valves, check valves and a pump motor. The pump motor builds up the brake pressure required during ABS or stability control. There are diagnostics for the pump motor.