Volkswagen Cars 2000-05

Wheels

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Wheel Lug Studs/Bolts



The Audi A4 and Passat models use wheel lug bolts that are threaded into a hub when installed. Apply an anti-seizing compound to the lug bolt treads before installation. Always inspect the threads of the lug bolts and replace them if they shows signs of cross-threading stretching, distortion or damage. If necessary, use a suitable tap to clean the threads of the hub.


NOTE
The wheel bolt diameter and thread pitch specification is M12 x 1.5mm on models with four lug bolts per wheel or M14 x 1.5 on models with five lug bolts per wheel. If a bolt is damaged it should be replaced and the threads in the hub cleaned with a suitable tap.

If a lug bolt is seized or rounded off, center punch the center of the lug bolt and use a high speed drill bit lubricated with oil to first drill a small (about 1 / 8 inch (3mm) pilot hole, the use a drill bit equal in size to the threaded portion of the lug bolts, and drill the head off the lug bolt. Lubricate the threaded portion of the lug bolt with a generous application of penetrating oil and alternately rap it on the end sharply with a hammer, then use a pair of locking pliers to remove the bolt. Clean the threads of the hub with a suitable tap and install a new lug bolt with a light coating of an anti-seizing compound.

Removal & Installation
With Disc Brakes
  1. Raise and support the appropriate end of the vehicle safely using jackstands, then remove the wheel.
  2.  
  3. Remove the brake pads and caliper. Support the caliper aside using wire or a coat hanger. For details, please refer to Section 9 of this manual.
  4.  
  5. Remove the outer wheel bearing and lift off the rotor. For details on wheel bearing removal, installation and adjustment, please refer to Section 1 of this manual.
  6.  
  7. Properly support the rotor using press bars, then drive the stud out using an arbor press.
  8.  


NOTE
If a press is not available, CAREFULLY drive the old stud out using a blunt drift. MAKE SURE the rotor is properly and evenly supported or it may be damaged.



Click image to see an enlarged view

Fig. View of the rotor and stud assembly



Click image to see an enlarged view

Fig. Pressing the stud from the rotor

To install:

  1. Clean the stud hole with a wire brush and start the new stud with a hammer and drift pin. Do not use any lubricant or thread sealer.
  2.  
  3. Finish installing the stud with the press.
  4.  



Click image to see an enlarged view

Fig. Use a press to install the stud into the rotor


NOTE
If a press is not available, start the lug stud through the bore in the hub, then position about 4 flat washers over the stud and thread the lug nut. Hold the hub/rotor while tightening the lug nut, and the stud should be drawn into position. MAKE SURE THE STUD IS FULLY SEATED, then remove the lug nut and washers.

  1. Install the rotor and adjust the wheel bearings.
  2.  
  3. Install the brake caliper and pads.
  4.  
  5. Install the wheel, then remove the jackstands and carefully lower the vehicle.
  6.  
  7. Tighten the lug nuts to the proper torque.
  8.  

With Drum Brakes
  1. Raise the vehicle and safely support it with jackstands, then remove the wheel.
  2.  
  3. Remove the brake drum.
  4.  
  5. If necessary to provide clearance, remove the brake shoes, as outlined in Section 9 of this manual.
  6.  



Click image to see an enlarged view

Fig. Exploded view of the drum, axle flange and stud



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Fig. Use a C-clamp and socket to press out the stud



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Fig. Force the stud onto the axle flange using washers and a lug nut

  1. Using a large C-clamp and socket, press the stud from the axle flange.
  2.  
  3. Coat the serrated part of the stud with liquid soap and place it into the hole.
  4.  

To install:

  1. Position about 4 flat washers over the stud and thread the lug nut. Hold the flange while tightening the lug nut, and the stud should be drawn into position. MAKE SURE THE STUD IS FULLY SEATED, then remove the lug nut and washers.
  2.  
  3. If applicable, install the brake shoes.
  4.  
  5. Install the brake drum.
  6.  
  7. Install the wheel, then remove the jackstands and carefully lower the vehicle.
  8.  
  9. Tighten the lug nuts to the proper torque.
  10.  

 
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