GM Bonneville/Eighty Eight/LeSabre 1986-1999

Front Hub, Bearing and Steering Knuckle

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

  1. Raise and support the vehicle safely. Place jackstands under the frame, then lower the vehicle slightly to allow the control arms to hang free.
  2.  
  3. Remove the tire and wheel assembly.
  4.  
  5. Insert a drift punch into the caliper and rotor vanes to prevent the rotor from turning, then remove the hub/drive axle nut. Clean the threads of the nut.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Before removing and installing the hub nut, immobilize the rotor by inserting a drift pin through the caliper, into the rotor

  1. Unfasten the caliper mounting bolts, then remove and support the caliper aside with a suitable piece of wire.
  2.  
  3. Remove the rotor by sliding it from the hub.
  4.  
  5. If equipped with ABS, detach the front wheel speed sensor connector and unclip it from the dust shield.
  6.  

The hub and bearing are replaced only as an assembly.

  1. For 1987-92 vehicles, perform the following:
    1. Using a suitable front hub spindle removal tool, separate the hub from the halfshaft.
    2.  
    3. Remove the hub and bearing retaining bolts, shield, hub and bearing assembly and the O-ring.
    4.  
    5. Separate the ball joint from the steering knuckle, using the proper tool.
    6.  
    7. Remove the halfshaft assembly and tap the seal from the steering knuckle. Remove the steering knuckle from the hub.

      Click image to see an enlarged view

      Fig. Fig. 2: Exploded view of the hub and bearing assembly, and the steering knuckle - 1993-99 vehicles

    8.  

  2.  
  3. For 1993-99 vehicles, perform the following:
    1. Unfasten the hub and bearing retaining bolts and dust shield.
    2.  
    3. Place the transaxle in PARK.
    4.  
    5. Using a suitable front hub spindle removal tool, separate the hub and bearing from the drive axle.
    6.  
    7. If necessary, remove the steering knuckle.
    8.  

  4.  
  5. Clean the rust and foreign material from the knuckle mounting face, bore and chamfer to allow the bearing to properly seat in the knuckle.
  6.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the hub and bearing assembly, and the steering knuckle - 1993-99 vehicles

To install:
  1. For 1993-99 vehicles, perform the following:
    1. If removed, install the steering knuckle.
    2.  
    3. Position the hub and bearing assembly to the drive axle. Apply a light coating of grease to the knuckle bore. If the new hub and bearing has a protective plastic cover, remove it before installation. Also, do not handle the knuckle or hub assembly by the ABS sensor wire.
    4.  
    5. Install a new drive axle nut and draw the hub and bearing onto the axle.
    6.  
    7. Place the transaxle in NEUTRAL.
    8.  
    9. Install the dust shield, being careful not to damage the bearing outboard lip seal.
    10.  
    11. Install the hub and bearing bolts, then tighten to 70 ft. lbs. (95 Nm).
    12.  

  2.  
  3. For 1987-92 vehicles, perform the following:
    1. Install a new hub and bearing seal in the steering knuckle with a suitable seal installation tool. Install the steering knuckle to the strut.
    2.  
    3. Lubricate the hub and bearing with grease. Fill the cavity between the seal and bearing completely.
    4.  
    5. Install the halfshaft.
    6.  
    7. Connect the ball joint to the steering knuckle and insert a new O-ring around the hub and bearing assembly.
    8.  
    9. Install the hub and bearing, and shield into the steering knuckle. Tighten the bolts to 70 ft. lbs. (90 Nm).
    10.  

  4.  
  5. If equipped, attach the ABS front wheel speed sensor connector, then clip the wire to the dust shield.
  6.  



Click image to see an enlarged view

Fig. Fig. 4: Attach the ABS wheel speed sensor connector, then clip the wire onto the dust shield

  1. Install the rotor and caliper assembly. Tighten the caliper bolts to 38 ft. lbs. (52 Nm).
  2.  
  3. Insert a drift punch into the caliper and rotor vanes to prevent the rotor from turning. If not already done, install the shaft washer and nut (if equipped). Tighten the nut to the following specifications:
  4.  
  5. 1987-88 vehicles: 3 ft. lbs. (270 Nm).
  6.  
  7. 1989-90 vehicles: 15 ft. lbs. (260 Nm).
  8.  
  9. 1991-99 vehicles: 107 ft. lbs. (145 Nm).
  10.  
  11. Install the tire and wheel assembly.
  12.  
  13. Carefully lower the vehicle, then tighten the lug nuts to 100 ft. lbs. (136 Nm).
  14.  

 
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