Investigation on the Performance of a Secondary Brake

In order to increase the safety of vehicles, the braking systems have two different braking sequences: the service brake and the secondary brake. The secondary brake is used when a component of the braking system fails to work adequately and it uses only two main components of the brake system, the calipers and the master cylinder. This paper presents a method of investigation, based on Matlab Simulink, to be used to verify the efficiency of the secondary brake by studying the dynamics behaviour, brake bias, stability and control during braking. The outputs are discussed by having in view, the ECE R13 regulations, for a vehicle with the initial speed at v = 60 km/h, mass m = 2300 kg, rolling radius r = 0.32 m, master cylinder mc = 22.2 mm, pedal ratio 4.3 and static friction coefficient 0.9. The results confirm that the variation of yaw rate and slip ratio have a minor influence on the stability and control.