Ball joints are maintenance free. The steel head of the support is pressed into a plastic housing with long life lubrication. Rubber covers are used to protect against dirt and moisture. The ingress of dirt acts on the hinge as an abrasive, under the influence of moisture, the support may eventually turn sour from corrosion. Checking the dirt-protective covers of ball bearings must be carried out as follows:
turn the wheels alternately in each direction;
check the condition of the mudguards of the right and left ball joints.
The cover cannot be replaced, the ball joint is replaced as an assembly.