Sagging springs. Spring will sag from overloading or if they have become weak. Loss of the shim from the coil spring seat on the coil-spring suspension will cause the spring to seem shorter and to sag.

• 弹簧下垂:重载或者弹簧变软均会引起弹簧下垂。螺旋弹簧悬架上弹簧座的垫片丢失,也会引起弹簧变软和下垂。