Dual ball joint suspension
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A dual ball joint suspension uses a pair of simple links to replace a wishbone in a MacPherson or SLA suspension. The outer end of each arm terminates in a ball joint, hence the name.
The two links, the spindle, and the body, form a four-bar link. Use of the linkage at the lower suspension connection of either a MacPherson strut or a short long arms suspension readily gives an effective virtual ball joint outboard of the spindle, which is very useful for a suspension designer, allowing negative scrub radius whilst allowing the ball joints to be placed farther inboard and thus out of the way of the brakes. Some manufacturers use a double ball joint arm to replace both wishbones on a short long arms suspension. This provides further opportunity for optimising the geometry.