Genuine Audi A3 Wheel Bearing

Audi A3 Wheel Bearing Parts and Q&A

• Hub & Bearing
  5K0-498-621-A
  Q:

  Can the rear wheel bearing be replaced without changing the rear wheel hub on Audi A3?

  A:

  The bearings of the rear wheels cannot be replaced without the replacement also of the rear hub because the outer races are made in the hub, and in case of excessive wear they cannot be seen without the replacement of the whole rear hub, and the rear hub nut must always be replaced when removed. The first step involves chocking the front roadwheels and jacking the rear of the vehicle high in the air and placing it on axle stands, unscrewing the handbrake and removing the corresponding rear roadwheel. The second step is to dismount the rear brake caliper and mounting bracket without disconnecting the hydraulic brake pipe, and positioning the caliper clear of the brake disc, and supported in an appropriate place. Unscrew the crosshead screw, take out the brake disc on the hub and take out the dust cap on the hub with a screwdriver or a cold chisel. Unscrew and take out the hub bolt using a multi-spline key, which is fixed to a high torque, and the socket extension bar may be required in order to loosen it; the hub bolt needs to be replaced every time. Insert a appropriate puller, remove the hub and bearings on the stub axle, and with a sharp cold chisel scrape the race off the stub axle base to ensure that the puller legs engage in the stub axle. Inspect the bearings and hub for wear, pitting and damage and where any damage can be identified, replace the hub entirely. To refit Refitting: Wipe the stub axle, ensure that the bearing races are sufficiently oiled with the appropriate grease and verify that the inner bearing race is properly aligned in the hub with the ABS rotor firmly fitted into the inner end of the hub. Position the hub as far as possible on the stub axle, screw on the new bolt and tighten it to the required torque. Inspect the dust cap and replace in case of damages with a properly tight dust cap that must be tapped by a hammer carefully into the hub to ensure the dust cap fits properly and no moisture should get into the bearing limiting its service life. Lastly, reinstall the brake disc and tighten screw of crosshead, reconnect rear brake mounting bracket and caliper, reconnect roadwheel and drop vehicle to the ground.