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A strut or brake-reaction rod is referred to as the bar that serves as a connection for the lower control arm to the vehicle frame body. It is used with a beam-type lower control arm composed of only one point of attachment to the body frame. Struts are used primarily on front-drive vehicles.

  • It is acted upon by compression forces. 
  • The assembly that combines the shock absorber with a coil spring is commonly known as the MacPherson Strut.
  • The bottom part of the strut is attached to the spindle for the rear wheel, while the lower part of the front strut is connected to the front wheel steering knuckle

Shock Absorber

A shock absorber is a tubular hydraulic device located near each wheel that controls or dampens spring oscillations. The upper part of the shock absorber attaches to a movable suspension such as the control arm or also known as the axle housing, which causes the shock to lengthen and shorten. The lower part of the shock absorber attaches to the vehicle body of the frame

  • It is an oil-filled cylinder that a piston moves up and down which forces the hydraulic fluid to flow through fluid passages or orifices in the piston
  • It may be mounted separately inside a shock absorber and strut assembly
  • The piston divides the cylinder into upper and lower chambers, wherein the piston orifices are restricted by spring-loaded check valves  that deflect under pressure