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Many independent front suspension systems incorporate compression-type coil springs mounted between the lower control arms and spring housing in the frame. Others have the coil springs mounted above the upper control arms, compressed between a pivoting spring seat bolted to the control arm and a spring tower formed in the front-end sheet metal.
Generally, the upper control arm pivots on a bushing and shaft assembly, which is bolted to the frame. The lower arm pivots on a bushing and shaft assembly or on a bolt cross frame member. When the lower control arm is not the A-frame type, its supported by strut, which runs diagonally from the lower control arm to a bracket attached to the frame. On some models, this strut serves as a support; on others, it provides a means of adjusting caster.
Stabilizers or sway bars are used in conjunction with front suspension on many cars to dampen rod shocks and minimize road sway. These bars are bracketed to the frame front cross member and extend from one lower control arm to the other.
