LR3/Disco 3
The wheel knuckle is a machined forging which is located between the upper and lower control arms. The knuckle is fitted
with two ball joints which are pressed into the knuckle, with the lower ball joint being secured with a circlip. The ball joints
are positioned between brackets on the upper and lower control arms and secured to the arms with a bolt and self-locking
nut.
The wheel knuckle provides the location for the rear wheel taper roller bearing, which is pressed into a machined bore
and retained with a circlip. The wheel bearing is a serviceable item. The knuckle has a machined bore which provides the
location for the wheel speed sensor. Four threaded holes allow for the attachment of the park brake assembly. A cast
boss on the knuckle provides positive location for the park brake assembly. Two bosses on the knuckle casting provide
the attachment points for the rear brake caliper.
The wheel hub is a machined casting which is pressed into the wheel bearing in the knuckle. The hub has a splined
centre bore which mates with corresponding splines on the halfshaft. Five M14 studs are pressed into the wheel hub and
provide for the attachment of the road wheel with wheel nuts. Rotation of the halfshaft is passed, via the splines, to the
wheel hub which rotates on the taper roller bearing.
