Raise the car in front.
Illuminate the anthers on the left and right and check their integrity, paying attention to traces of grease on the cuffs and nearby.
If the boot is damaged, to ensure safety, replace the corresponding joint with boot. Penetrating moisture will surely destroy the hinge.
Check the tightness of the fastening of the nut and the cotter pin of the hinge, however, do not overtighten the nut.