General Description
The two arms, the spindle, and the body, form a four-bar link. Use of the linkage at the lower suspension connection of either a McPherson 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 move in 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.
Read more about this topic: Dual Ball Joint Suspension
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