Audi Cars 1999-05

Strut (MacPherson Strut) Assembly

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Removal & Installation



  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Rear wheel
     
    Strut covers, the remove the strut-to-body nuts/bolts.
     
    Strut-to-rear wheel knuckle assembly. Remove the strut from the vehicle
     

  4.  

To install:

  1. Install or connect the following:

    Strut. Torque the strut to body bolts to 15 ft. lbs. (20 Nm) and the knuckle bolt to 66 ft. lbs. (89 Nm)
     
    Strut covers
     
    Rear wheel
     

  2.  



Click image to see an enlarged view

Fig. Be sure to support the trailing arm before removing the lower strut mounting bolt-A4 models

  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Support the trailing arms.
  4.  
  5. Remove or disconnect the following:
    NOTE
    In addition to the bolted connection, the strut is also attached to the body by 4 retaining lugs.



    Lower strut mounting bolt
     
    Rear seat backrest side bolster cover or backrest to access the upper mounting
     
    Upper strut-to-body mounting nuts
     

  6.  
  7. Turn the strut until the retaining lugs are positioned above the recesses, then pull the strut downward out of its mount.

    Click image to see an enlarged view

    Fig. After loosening the 2 attaching bolts, rotate the upper strut mount to disengage the strut from the vehicle-A4 models

  8.  

To install:


NOTE
The bonded rubber bushing can only turned to a limited extent. The bolted connections between the suspension strut and the rear axle should therefore only be tightened when the vehicle is standing on the ground.

  1. Install or connect the following:

    Strut by engaging the retaining lugs
     
    Upper strut-to-body. Torque the nuts to 18 ft. lbs. (25 Nm)
     
    Lower strut. Torque the bolt to 37 ft. lbs. (50 Nm) plus a 1 / 4 (90 degree) turn with the suspension loaded
     
    Rear seat backrest side bolster cover or backrest
     

  2.  

All Wheel Drive
  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Loosen the wheel lug bolts slightly.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Remove the wheel assembly.
  8.  
  9. Loosen the lower strut-to-control arm bolt and nut.
  10.  
  11. Loosen the upper control arm-to-bearing housing through bolt and nut.
  12.  
  13. Remove the upper strut support bracket-to-body fasteners, then remove the through bolts and nuts previously loosened.
  14.  
  15. Pull downward on the wheel bearing housing and remove the strut along with the upper control arm link. If necessary, prior to pulling down on the wheel bearing housing, disconnect the sway bar link.
  16.  
  17. Installation is in reverse order of removal noting the following:
  18.  
  19. During assembly observe the following torque specifications and information.
  20.  
  21. If removed, torque the upper control arm-to-mounting bracket with the control arm horizontal using a new nut and bolt.
  22.  
  23. Make sure to torque the upper control arm-to-bearing housing and the lower strut-to-control arm using new nuts and bolts with the vehicle's wheels resting on the ground.
  24.  

Strut-to-mounting bracket (replace)



Step 1: 52 ft. lbs. (70 Nm)
 
Step 2: 90° ( 1 / 4 turn)
 

Upper control arm-to-mounting bracket (replace)



Step 1: 37 ft. lbs. (50 Nm)
 
Step 2: 90° ( 1 / 4 turn)
 

Upper control arm-to-bearing housing (replace)



Step 1: 37 ft. lbs. (50 Nm)
 
Step 2: 90° ( 1 / 4 turn)
 
Strut bracket-to-body: 41 ft. lbs. (55 Nm)
 

Strut-to-lower control arm (replace)



Step 1: 52 ft. lbs. (70 Nm)
 
Step 2: 90° ( 1 / 4 turn)
 
Sway bar link-to-sway bar, nut (replace): 30 ft. lbs. (40 Nm)
 
Sway bar link-to-wheel bearing housing, nut (replace): 37 ft. lbs. (50 Nm)
 



Click image to see an enlarged view

Fig. The lower mount of the rear strut assembly is attached to the lower control arm with a through bolt

Front Wheel Drive
  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Remove the rear seat side backrest cover or backrest as necessary to access the upper strut mounting bolts and remove the bolts.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Remove the rear wheel.
  8.  
  9. Remove the lower strut to axle beam mounting bolt and nut and turn the strut assembly until the catches align with the openings in the body, then remove the strut assembly.
  10.  
  11. Installation is in reverse order of removal. Note the following:
  12.  
    1. Tighten the upper shock mount-to-body nuts to 18 ft. lbs. (25 Nm).
    2.  
    3. Install a new lower shock-to-axle beam bolt and nut hand tight, and then carefully lower the vehicle.
    4.  
    5. With the vehicle on its wheels, tighten the lower shock bolt as follows:
    6.  
    7. Using a new nut and bolt set, tighten shock absorber-to-axle beam in 2 steps:
    8.  


      Step 1: 37 ft. lbs. (50 Nm)
       
      Step 2: 90° ( 1 / 4 turn)
       





Click image to see an enlarged view

Fig. The strut upper mounting bolts are accessed through the interior

 
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