Abstract: Apparatus for detecting an imbalance of a vehicle comprising, in combination, an upper attachment member removably secured with respect to the upper portion of a shock absorber; a lower attachment member removably secured with respect to the lower portion of a shock absorber; a vertically extending rod fixedly secured with respect to the lower attachment member and slidably secured with respect to the upper attachment member; a roller secured to the upper attachment member with the roller adapted to rotate with respect to the rod during normal reciprocation thereof but to shift with respect to its axis during abnormal extend movement of the rod as caused by an emergency situation; and a switch secured to the upper attachment member in a first electrical state during normal reciprocation of the rod but switched to a second electrical state upon the shifting of the roller in response to abnormal movement of the rod indicative of an abnormal situation for emitting a signal in response thereto.