Checking the dust caps of the axle joints: when checking the axle joint seals (arrows on the right) you also need to take a look at the cuffs of the connecting rods of the stabilizers (arrows on the left).
Check the steering folds for cracks: the best way to find leaks is by stretching the folds (arrow).
The condition of the dust seals should be checked regularly (arrow) tie rod heads. Tie rod heads with torn cuffs must be completely replaced; cuffs are not sold separately in spare parts warehouses.
Front axle pivots between four wishbones and wheel bearing housing (common name «rounded fist») not subject to maintenance. The steel ball heads of the axle joints are placed in a long-term lubricant and additionally in synthetic shells. Rubber dust caps protect against moisture and dirt. Penetrating dirt acts as an abrasive on the hinge; dampness causes it to rust over time.
Order of execution
1. Turn the steering wheel fully to one side.
2. Check up covers of hinges of an axis on the right and at the left on presence of damages.
3. The dust cap cannot be changed separately. It is necessary to change the entire hinge, which makes sense, since dirt and water have probably already penetrated through the crack.
4. Therefore, the hinge is considered defective even before the gap or squeaks become noticeable in it.
5. Replace hinge.
Tip: When checking the axle joint seals, you can simultaneously take a control look at the joint collars of the stabilizer link rods on the front and rear axles (only in quattro). Due to their subordinate function, they are not safety nodes, but with failed hinges, the resulting knock is at least burdensome.
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