Mazda 323/626/929/GLC/MX-6/RX-7 1978-1989

Brake Drums

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CAUTION
Brake shoes may contain asbestos, which has been determined to be a cancer causing agent. Wear an approved filter mask or respirator whenever working around brakes, to avoid inhaling dust from any brake surface. Never clean brake components with compressed air! Instead, use a commercially available brake cleaning fluid.

REMOVAL & INSTALLATION



Rear Wheel Drive Vehicles
  1. Remove the wheel disc and loosen the lug nuts.
  2.  
  3. Raise the rear of the car and support it with jackstands.
  4.  
  5. Remove the lug nuts and the rear wheel.
  6.  
  7. Be sure that the parking brake is fully released.
  8.  
  9. Remove the bolts or screws which secure the drum to the rear axle shaft flange or center locknut.
  10.  

If the drum will not come off easily, screw the drum securing bolts into the two tapped holes in the drum. Tighten the bolts evenly in order to force the drum away from the flange.

  1. Adjust the shoes after installation is completed or prior to installation on GLC.
  2.  

Front Wheel Drive GLC, 323, 626 and MX-6

See Figures 1, 2, 3, 4, 5, 6 and 7

  1. Loosen the rear wheel lugnuts. Raise the vehicle and support it securely. Remove the lugnuts and wheel.
  2.  
  3. If equipped, carefully pry off the hub (grease) cap.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Remove the grease cap to expose the hub retainer



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Fig. Fig. 2: Use a hammer and chisel to carefully unstake the locknut



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Fig. Fig. 3: Use a socket wrench to loosen ...



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Fig. Fig. 4: ... then remove the locknut



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Fig. Fig. 5: The hub washer seats against the outer bearing



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Fig. Fig. 6: Grasp the brake drum by its edges . .



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Fig. Fig. 7: ... and pull it away from the vehicle

  1. Unstake the locknut and remove it. Pull off the drum, being careful to catch the washer and bearings if they fall out of the center of the drum. If it is difficult to remove the drum:

    On GLC, remove the lever stop from the backing plate to increase the brake shoe clearance.
     
    On 323, 626 and MX-6, remove the backing plate plug to increase the shoe clearance. If this does not make it easy to remove the drum, loosen the parking brake lever adjustment nut or the operating stop lever at the backing plate.
     

  2.  

To install:
  1. Install the brake drum with the washer and bearing. Install a new locknut and adjust the preload as described in Suspension & Steering . On 1988-89 626s and MX-6s, torque the locknut to 72-130 ft. lbs. (98-176 Nm).
  2.  

Be sure to stake the new locknut when the preload adjustment is complete.

  1. If equipped, install the grease cap.
  2.  
  3. Install the rear wheels and lower the vehicle.
  4.  

INSPECTION



  1. Examine the drum for cracks or overheating spots. Replace the drum if either of these are present.
  2.  
  3. Check the drum for scoring. Light scoring can be corrected with sandpaper.
  4.  
  5. Check the drum with a dial indicator for out-of-roundness; turn the drum if it is beyond the specifications shown in the Brake Specifications Chart.
  6.  
  7. If the drum must be turned because of excessive scoring or out-of-roundness, the drum's inside diameter should not exceed the specifications shown in the chart.
  8.  

If one drum is turned, the opposite drum should also be turned to the same size.

 
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