The phase difference between right and left front wheel torque variation and the resonance of lower control arm bushings are the main reasons of steering shimmy.

• 由分析成果得知，煞车碟盘厚度变化会造成煞车扭力之起伏，而左右轮煞车扭力起伏之相位差与下控臂前后方向运动的共振放大现象，为方向盘圆周方向振动的主要成因；