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Torsion bar suspension uses the flexibility of a steel bar or tube,
twisting lengthwise to provide spring action. Instead of the flexing
action of a leaf spring, or the compressing-and-extending action of a
coil spring, the torsion bar twists to exert resistance against
up-and-down movement. Two rods of spring steel are used in this type
of suspension. One end of the bar is fixed solidly to a part of the
frame behind the wheel; the other is attached to the lower control
arm. As the arm rises and falls with wheel movement, the bar twists
and absorbs more of the road shocks before they can reach the body of
the car. The bar untwists when the pressure is released, just like a
spring rebounding after being compressed.
Adjusting the torsion bars controls the height of the front end of
the vehicle. The adjusting bolts are located at the torsion bar
anchors in the front crossmember. The inner ends of the lower control
arms are bolted to the crossmember and pivot through a bushing.
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