一般将车辆在制动过程中维持直线行驶或按预定弯道行驶的能力称为车辆制动的方向稳定性。农用运输车在制动过程中 ,有时会出现跑偏、后轴侧滑或前轮失去转向能力 ,而改变原来的行驶方向 ,甚至发生驶入对方车辆行驶车道、滑下沟坡等危险情况。这是造成交通事故的重要原因。现对 Generally, the ability of the vehicle to maintain a straight line or a predetermined curve during braking is referred to as the directional stability of the vehicle brake. Agricultural vehicles in the braking process, sometimes there will be deviation, the rear axle skid or the front wheel loses the steering ability, and change the original driving direction, and even into the other vehicle driving lane, slide down the slope and other dangerous situations. This is an important cause of traffic accidents. Right now