Before checking the bearing, make sure the hub nut is securely tightened (the tightening torque is specified in the section "Technical data").
Check the condition of the bearings by lifting each front wheel in turn so that it does not touch the ground (see chapter "Basic rules for carrying out work") and rotating it. Replace the bearings if the bearings are noisy or the wheel feels uneven (sticking), or if the wheel moves excessively when rocking it up and down.
The wheel bearing is sealed and has a lifetime supply of grease. When the hub is removed from the steering knuckle, the bearing is destroyed.
1. Loosen the hub nut at the end of the drive shaft (the car is on the ground).
2. Loosen the wheel mounting bolts, raise the corresponding side of the vehicle and remove the wheel.
3. Remove the two brake caliper mounting bolts, remove the caliper from the steering knuckle and hang it up (for example, on a suspension spring) using a wire hook. There is no need to disconnect the brake hose from the caliper.
4. Loosen the mounting screw and remove the brake disc.
5. Disconnect the steering rod from the steering knuckle arm using a ball joint puller (see chapter "Steering").
6. Remove the clamp bolt (and nut) securing the ball joint to the steering knuckle and separate the lower suspension arm from the knuckle (15, figure M:8).
7. Remove the two bolts securing the steering knuckle to the telescopic strut. The top bolt is an eccentric bolt and is used to adjust the wheel camber; a puller will be required to remove this bolt. Mark the position of the eccentric bolt (figure M:2) to install it in the same position later. Also mark the position of the eccentric washer installed on the bolt (5, figure M:8).
8. Remove the hub nut and remove the steering knuckle together with the hub from the drive shaft.
9. Press the hub out of the steering knuckle using a drift (figure M:3 shows a special VW device, but if you don't have one, you can clamp the steering knuckle in a vice). The wheel bearing will be destroyed, and its inner ring will remain on the hub.
10. Pull the inner bearing race off the hub using a puller (figure M:4). It may be necessary to sharpen the puller jaws.
11. Remove the two large snap rings installed in the steering knuckle bore (one on each end) and press out the outer bearing ring - Figure M:5. If a socket head is used as a mandrel, make sure that it matches the bore diameter, as even minor damage to the bore walls will unacceptably weaken the bearing fit.
12. Install the new snap ring from the outside edge of the hole, making sure it is fully seated in the groove.
13. Install the steering knuckle on the stand and press the new bearing into it from the back until it stops (figure M:6). The bearing should enter the hole evenly, without tilting. Install the second retaining ring.
14. Press the wheel hub into the steering knuckle as shown in Figure M:7, using the mandrel only on the inner bearing ring.
15. Install the steering knuckle assembly onto the vehicle in the reverse order of removal.
16 When installing the eccentric bolt, align it with the mark made before disassembly. Do not forget to install the eccentric washer.
17. Tighten all mounting bolts and nuts to the torque specified in section "Technical data".
18. Install the wheel and lower the vehicle to the ground. Install the NEW hub nut and tighten it to 24.0 kg·m.
19. Check the wheel alignment and camber, adjust them if necessary.
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