Bridge gauge feet should be put at original marker location on the basic of bush combination surface, adhesion, and should pay attention to the direction of the front and rear of bridge gauge not to put upside. Use feeler no more than three, and each thickness not significant different, pressed the feeler on the bearing neck, gently moving into the gap, adjust feeler thickness, until the feeler just lightly hit bridge gauge and also can through the gap as well. The total thickness of feeler is the bridge gauge measured value, compare the bridge gauge measured value with the previous overhaul measured value, if bridges gauge value increases, then It indicates that the bush wear and make the bearing neck sink or bush pad and steel pad have been adjusted thinning.