VW Passat & Audi A4 1990-2000

Tone (Exciter) Ring

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REMOVAL & INSTALLATION
Front
1990-97 Passat Models

On 1990-97 Passat models, the front tone rings are fastened to the inside of the front hub assembly. To replace requires removal of the front hub and replacement of the front wheel bearing assembly.

  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Remove the front hub. For additional information, please refer to the following topic(s): Suspension and Steering, Front Suspension, Front Wheel Bearings.
  4.  
  5. Remove the countersunk screws securing the tone ring to the hub. If necessary use a hand impact driver with a suitable Phillips bit.
  6.  
  7. Installation is in reverse order of removal noting the following:
  8.  


NOTE
Make sure to install the tone ring to the wheel hub BEFORE pressing the hub into the front wheel bearing.

A4 And 1998-00 Passat Models

On A4 and 1998-00 Passat models, the front tone rings are part of the outer CV-joints and not available as a separate part. If the tone ring must be replaced, the outer CV-joint must be replaced. For additional information, please refer to the following topic(s): Drive Train, Halfshaft, CV-Joint and Boot Overhaul

Rear
1990-97 Passat Models
  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Remove the rear brake disc assembly.
  4.  
  5. Using a suitable brass punch, drive the tone ring off the rotor by tapping it from side to side from the inside of the hub where the wheel bearing races are located.
  6.  

To install:

  1. Carefully press the tone ring onto the inside of the brake rotor making sure it is fully seated.
  2.  
  3. The balance of the installation is in reverse order of removal.
  4.  

A4 And 1998-00 Passat All wheel drive (AWd) models

On A4 and 1998-00 Passat models, the rear tone rings are part of the outer CV-joints and not available as a separate part. If the tone ring must be replaced, the outer CV-joint must be replaced. For additional information, please refer to the following topic(s): Drive Train, Halfshaft, CV-Joint and Boot Overhaul.

A4 And 1998-00 Passat front wheel drive (fwd) models
  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Remove the rear brake disc assembly.
  4.  
  5. Using a suitable brass punch, drive the tone ring off the rotor by tapping it from side to side from the inside of the hub where the wheel bearing races are located.
  6.  

To install:

  1. Carefully press the tone ring onto the inside of the brake rotor making sure it is fully seated.
  2.  
  3. The balance of the installation is in reverse order of removal.
  4.  



Click image to see an enlarged view

Fig. The front ABS tone (exciter) ring is part of the outer CV-joint on A 4 and 1998-00 Passat models. The rear tone ring is similar on the AWD version of these models

 
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