The stability of the vehicle is monitored eg. to determine slew etc. and correction signals are computed for the two front brakes. This enables the control to counteract instability eg. by controlled braking of the outside front wheel during cornering to correct oversteer. The control includes a failsafe mode which blocks the control if a fault is detected which persists for more than a programmed time. The control system uses the wheel speed sensors on the wheels as well as other sensors to determine the degree of instability. Failure of one signal switches the mode of control to remain at the current level with eventual block of the control if the fault persists more than a set time.
