Phenomenon: in the high-speed driving light step brake deceleration, when the speed dropped to 110 ~ 130km, the steering wheel jitter. This phenomenon does not exist when it is below or above this speed range.
    Maintenance: First of all, the car from the front and rear suspension check the ball and the ball, are normal, but the right rear tire wear more serious. According to the driver said: the car in a driving after the right wheel was hit, tires and wheels damaged scrapped. After the replacement of a new set soon after, they found abnormal tire wear, and the above symptoms appear. After the introduction of the driver, the tire replacement, and made a dynamic balance, and then the vehicle was four wheel positioning adjustment, complete the test failure remains the same. According to experience, high-speed driving light step on the brake pedal when the steering wheel jitter, and more with the ball bar loose, brake disc deflection, and occurred in the front drive car front wheel. Check the front wheel brake disc, no abnormal phenomenon. Taking into account the car before and after the bridge are used independent suspension, but also the rear wheel drive, rear wheel and the use of disc brakes, and after the right wheel has been hit, so the focus of the detection of the brake disc. With the dial indicator to determine the maximum swing of 0.13mm, exceeding the specified value. Replaced a new brake disc after the road test, troubleshooting.