BMW Cars 1999-06

Upper Control Arms

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove the tire and wheel assembly.
  4.  
  5. Support the lower trailing arm at the hub with a suitable jack and disconnect the stabilizer bar at the control arm and the subframe.
  6.  
  7. Remove the shock absorber lower mounting bolt.
  8.  
  9. Lower the trailing arm slowly and remove the spring to the side.
  10.  

To install:

  1. Install the spring with the bushing in place and the top of the upper spring ring lubricated.
  2.  
  3. Raise the trailing arm to a level where the bolt can be replaced in the lower shock mount. Connect the stabilizer bar. Do not fully tighten the bolts at this time.
  4.  
  5. Install the tire and wheel assembly.
  6.  
  7. Tighten the stabilizer bolt to 16 ft. lbs. (21.5 Nm) and the shock bolt to 63 ft. lbs. (87 Nm) with the control arm in the normal ride position.
  8.  


    Click image to see an enlarged view

    Fig. Support the trailing arm (1)-3 Series, except Z3 and Z4



    Click image to see an enlarged view

    Fig. Remove the coil spring-3 Series, except Z3 and Z4


  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Rear portion of the exhaust system and support it from the body
     
    Final drive rubber mount, push it downward, and hold it down with a suitable wedge
     
    Bolt that connects the rear stabilizer bar to the strut on the side being worked on. Be careful not to damage the brake line.
     

  4.  


NOTE
Support the lower control arm securely with a suitable jack or other device that will permit it to be lowered gradually, while maintaining a secure support.

  1. Then, to prevent damage to the output shaft joints, lower the control arm only enough to slip the coil spring off the retainer.
  2.  

To install:



Click image to see an enlarged view

Fig. Rear suspension setup on Z3 and Z4 models

  1. Be sure, when replacing the spring, that the same part number, color code, and proper rubber ring are used. Install the spring, making sure that the spring is in proper position.
  2.  
  3. Keep the control arm securely supported while raising and replace the shock bolt. Install the bolts in the final drive rubber mount and tighten to 69 ft. lbs. (95 Nm).
  4.  
  5. Tighten the stabilizer bolt to 16 ft. lbs. (21.5 Nm), and the shock bolt to 63 ft. lbs. (87 Nm) with the control arm in the normal ride position. Install the exhaust system.
  6.  

The coil spring is removed along with the shock absorber. The 5 and 7 Series use a "coil over" type shock absorber where the spring is mounted to the shock in one compact unit. Once the shock is removed from the vehicle, the spring can be compressed and separated from the shock absorber.

E30 Models
  1. Raise and safely support the vehicle.
  2.  
  3. Disconnect the rear portion of the exhaust system and hang it from the body.
  4.  
  5. Disconnect the final drive rubber mount, push it down, and hold it down with a wedge.
  6.  
  7. Remove the bolt that connects the rear stabilizer bar to the strut on the side being worked on. Be careful not to damage the brake line.
  8.  


NOTE
Support the lower control arm securely with a jack or other device that will permit it to be lowered gradually, while maintaining secure support.

  1. Then, to prevent damage to the output shaft joints, lower the control arm only enough to slip the coil spring off the retainer.
  2.  



Click image to see an enlarged view

Fig. The trailing arm suspension as used on E30 vehicles

To install:

  1. Make sure, in replacing the spring, that the same part number, color code, and proper rubber ring are used. Install the spring, making sure that the spring is in proper position.
  2.  
  3. Keep the control arm securely supported while raising and replace the shock bolt. Install the bolts in the final drive rubber mount and tighten to 69 ft. lbs. (95 Nm).
  4.  
  5. Tighten the stabilizer bolt to 16 ft. lbs. (21.5 Nm), and the shock bolt to 63 ft. lbs. (87 Nm) with the control arm in the normal ride position. Install the exhaust system.
  6.  

E36 Models
  1. Raise the rear of the vehicle and support securely. Do not support on the suspension components.
  2.  
  3. Support the lower trailing arm at the hub and disconnect the stabilizer bar at the control arm and the subframe.
  4.  
  5. Remove the shock absorber lower mounting bolt. Lower the trailing arm slowly and remove the spring to the side.
  6.  

To install:

  1. Install the spring with the bushing in place and the top of the lubricated.
  2.  
  3. Raise the trailing arm to a level where the bolt can be replaced in the lower shock mount. Connect the stabilizer bar.
  4.  
  5. Tighten the stabilizer bolt to 16 ft. lbs. (21.5 Nm), and the shock bolt to 63 ft. lbs. (87 Nm) with the control arm in the normal ride position.
  6.  



Click image to see an enlarged view

Fig. Removing the sway bar link bracket locknut



Click image to see an enlarged view

Fig. The sway bar link bracket shown removed



Click image to see an enlarged view

Fig. Support the lower control arm when removing the lower shock bolt, otherwise the threads may be damaged

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the rear wheel.
  4.  
  5. Remove the rear spring as outlined in this section.
  6.  
  7. Disconnect the upper sway bar bracket as outlined in this section.
  8.  
  9. Remove the upper control arm-to-trailing arm locknut and through bolt.
  10.  
  11. Disconnect the driveshaft from the differential. Refer to Section 7 for specific details if necessary.
  12.  
  13. Support the differential assembly and remove the two upper and lower mounting bolts, and leaving the axles attached, move the differential enough to access the upper control arm-to-subframe fastener.
  14.  
  15. Remove the ABS cable from the upper control arm.
  16.  
  17. Remove the upper control arm-to-subframe fasteners, then remove the control arm.
  18.  

To install:

  1. Installation is in reverse order of assembly, noting the following rear suspension fastener torque specifications :

    Upper control arm-to-subframe M12 10.9 fasteners: 57 ft. lbs. (77 Nm)
     
    Lower control arm-to-subframe M12 10.9 fasteners: 57 ft. lbs. (77 Nm)
     
    Control arm top/bottom-to-trailing arm bolts: 81 ft. lbs. (110 Nm)
     
    Trailing arm bushing bracket-to-body bolts: 57 ft. lbs. (77 Nm)
     
    Trailing arm bushing-to-bracket through bolt: 81 ft. lbs. (110 Nm)
     
    Lower shock mounting bolt: 57 ft. lbs. (77 Nm), or if marked 10.9, 74 ft. lbs. (100 Nm).
     

  2.  

 
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