The front suspension is fully independent, using upper and lower wishbones, concentric spring/damper assemblies and an anti-roll bar. The top wishbone comprises two similar pressed steel arms, sandwiching at their outboard ends the steering swivel top ball joint. Shims fitted between the wishbone arms and chassis, and between the arms and ball joint, permit adjustment of castor angle, and selective offset washer plates at the wishbone outer ends allow for camber adjustment. The lower wishbone consists of a main channel section track control arm to which the spring/damper unit connects, and an integral tubular brace running forward to a second bonded rubber pivot bush. The anti-roll bar locates in two chassis mounted rubber bushes, and engages into flexible spherical rubber bushes housed in the lower wishbones.
The concentric coil spring/telescopic damper units use a fabricated top abutment for the spring and damper, which is bolted to the chassis tower. Springs on the S4 are conical in shape in order to resist bowing, with the greater diameter lowermost, whilst the higher rate Sport 300 springs are parallel. Sport 300 models also use high specification 'N65' type dampers which require larger apertures in the lower wishbones in order to clear the greater diameter of the damper bodies.
A stub axle, integral with the vertical link (hub carrier), carries each front hub on two taper roller bearings which are adjustable for end float. The offset fixing holes for the top and bottom ball joints result in the vertical links being handed, and are identified by green paint for the RH unit, and red for the LH.