member to the chassis.
When coil springs are used in both front and rear suspension, three or four control
arms are placed between the rear axle housing and the frame to carry driving and
brake torque. The lower control arms pivot on the frame members and sometimes
support the rear coil springs to provide for up-and-down movement of the axle and
wheel assembly.
A-arms are control arms with two inboard pivots, giving strength.
Some front end designs use control arms instead of A-arms. usually to save
weight and add adjustability.
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