To study the effect of groove-texture on disc brake squeal of disc brake systems,based on the frictional self-excited vibration theory,the finite element models of disc brake system with ordinary pad and grooved pad were established respectively.The friction self-excited vibration characteristics of the disc brake systems were studied by using complex eigenvalue analysis method.The parametric analysis of groove width and depth was carried out by using the finite element model,and the variation law of their effects on brake squeal was obtained.The results show that the friction self-excited vibration between the brake pad and the brake disc is the main cause of brake squeal.The grooved pad has a significant effect on restraining the possibility of brake squeal.Parametric analysis shows when the groove depth is in the range of 5 mm to 20 mm,the stability of disc braking system shows a gradual decrease with the increase of groove depth,indicating that the smaller the groove depth,the less the possibility of friction self-excited vibration.When the groove width is in the range of 5 mm to 20 mm,the stability of the brake system decreases first and then increases.When the groove width is 10 mm,the system is most likely to brake squeal.