Wheel sensor, rear (VIN: X3025752-)
| Wheel sensor, rear (VIN: X3025752-) | 
| To remove | 
| 1. | 
        Raise the car and remove the wheel.
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| 2. | 
        Press back the brake piston with slip-joint pliers.
         
        
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| 3. | 
        Remove the brake caliper and suspend it.
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| 4. | 
        Back off the handbrake adjuster. It is accessible through a hole in the brake disc.
         
        
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| 5. | 
        Remove the brake disc retaining bolt. Remove the brake disc.
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| 6. | 
        Remove the air separator.
         
        
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| 7. | 
        Remove the bolt securing the handbrake cable mounting.
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| 8. | 
        Unplug the connector from the wheel sensor.
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| 9. | 
        Detach the wheel sensor cable from the holder.
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| 10. | 
        Remove the mounting for the wheel sensor cable and brake pipe (2 nuts).
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| 11. | 
        Remove the wheel hub nuts. Use a long 15mm socket with 3/8 drive, part no. 30 34 444 and extension with ball fitting.
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| 12. | 
        Remove the wheel hub from the disc back-plate. Let the disc back-plate and handbrake unit hang from the cable.
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| To fit | 
| 1. | 
        Clean the contact surfaces using a wire brush.
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| 2. | 
        Fit the wheel hub on the back-plate and secure them to the longitudinal link using new nuts. Tighten the nuts alternately.
         Tightening torque: 50 Nm +30° (40 lbf ft +30°).  | 
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| 3. | 
        Fit the brake disc.
         Fit the lock screw with Loctite 242. Tightening torque: 10 Nm (7 lbf ft). | 
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| 4. | 
        Adjust the handbrake, see
        
         Adjusting handbrake shoes
        
        .
         
        
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| 5. | 
        Fit the brake caliper. Use 74 96 268 Loctite 242 on the bolts.
         Tightening torque: 80 Nm (59 lbf ft).  | 
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| 6. | 
        Fit the mounting for the wheel sensor cable and brake pipe.
         Tightening torque: 24 Nm (18 lbf ft).  
        
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| 7. | 
        Fit the wheel sensor cable to the mounting.
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| 8. | 
        Plug in the connector to the wheel sensor.
         
        
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| 9. | 
        Fit the mounting for the handbrake cable.
         Tightening torque: 8 Nm (6 lbf ft).  | 
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| 10. | 
        Fit the air separator.
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| 11. | 
        Fit the wheel. See
        
         Wheels
        
        .
         Tightening torques aluminium rim 110 Nm (81 lbf ft) pressed steel rim 50 Nm +2x90°, max. 110 Nm (37 lbf ft +2x90°, max. 81 lbf ft)  | 
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| 12. | 
        Lower the car to the floor.
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| 13. | 
        Depress the brake pedal to press out the pistons in the brake calipers.
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