Chrysler Front Wheel Drive Cars 4-CYL 1981-1995 Repair Information

Brake Drums

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REMOVAL & INSTALLATION



Except Premier

CAUTION
Brake shoes may contain asbestos, which has been determined to be a cancer-causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

See Figures 1 through 7

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Fig. Fig. 1: Use a small prytool to remove the grease cap from the brake drum ...



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Fig. Fig. 2: ... then remove the old cotter pin with pliers



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Fig. Fig. 3: Remove the nut lock from the end of the axle shaft, then ...



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Fig. Fig. 4: ... loosen the axle shaft hub nut



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Fig. Fig. 5: Remove the axle nut and washer from the axle shaft, then ...



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Fig. Fig. 6: ... pull the brake drum and outboard bearing off of the axle together



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Fig. Fig. 7: Once the brake drum is removed, the outboard bearing is easily removed


WARNING
On vehicles equipped with a Bendix Type 6 Anti-lock Brake System (ABS), a Diagnostic Readout Box (DRB or DRB II) is necessary for brake system bleeding. Failure to use a DRB to bleed the system will lead to system failure. Refer to the ABS portion of this section for bleeding procedures and precautions.

  1. Slightly loosen the rear wheel lug nuts.
  2.  
  3. Raise the car and safely support it with jackstands.
  4.  
  5. Remove the rear wheels.
  6.  
  7. Loosen the parking brake cable adjustment by backing off the adjusting nut.
  8.  
  9. Remove the access hole plug from the rear brake backing plate, then insert a brake spoon or similar prytool and release the brake shoe drag (to gain further clearance for brake drum removal, if necessary). For more details, refer to the rear brake adjustment procedure located in the beginning of this section.
  10.  
  11. Remove the grease cap covering the end of the axle shaft and hub nut.
  12.  
  13. Remove the cotter pin, locknut, retaining nut and washer from the stub axle.
  14.  
  15. Pull the brake drum and bearings off of the axle stub.
  16.  


WARNING
Be careful not to allow the bearings to drag across the threaded portion of the stub axle, otherwise new bearings may be needed upon installation.

To install:

Since the rear drum is off of the axle, this would be an excellent opportunity to regrease the rear wheel bearings. For more details, refer to Suspension & Steering .

  1. Slide the hub onto the stub axle, making sure that the inboard bearing is installed in the drum.
  2.  
  3. Install the outboard bearing over the axle shaft, then install the hub nut.
  4.  
  5. Tighten wheel bearing adjusting nut (hub nut) to 20-261 inch lbs. (27-34 Nm) while rotating the drum-this seats the bearings on the axle shaft. Back off (loosen) the adjusting nut 1 / 4 turn (90°), then tighten the adjusting nut finger-tight.
  6.  
  7. Install the locknut on the axle shaft, then tighten against the hub nut until the locknut is snug and aligned with the hole in the axle shaft.
  8.  
  9. Install a new cotter pin and bend the cotter pin ends tightly against the axle tip.
  10.  

Premier

See Figure 8

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Fig. Fig. 8: Rear brake drums on the Premier are held in place by 2 or 3 retaining nuts-the hub nut does not need to be removed


WARNING
On vehicles equipped with a Bendix Type 6 Anti-lock Brake System (ABS), a Diagnostic Readout Box (DRB or DRB II) is necessary for brake system bleeding. Failure to use a DRB to bleed the system will lead to system failure. Refer to the ABS portion of this section for bleeding procedures and precautions.

  1. Slightly loosen the rear wheel lug nuts.
  2.  
  3. Raise and safely support vehicle.
  4.  
  5. Remove the wheels.
  6.  
  7. Matchmark the drum and one of the lug nut studs for reinstallation.
  8.  
  9. Remove the drum retaining nuts and pull the drum from the hub.
  10.  
  11. If the drum is difficult to remove, the brake shoes are probably holding the drum in place and must be backed off. For more details, refer to the rear drum brake adjusting procedure located in the beginning of this section.
  12.  

To install:
  1. Slide the brake drum onto the rear hub with the matchmarks lining up.
  2.  
  3. Install new drum retaining nuts to hold the drum on the hub.
  4.  
  5. Install the rear wheels and tighten the lug nuts until snug.
  6.  
  7. Lower the vehicle to the ground.
  8.  
  9. Tighten the rear wheel lug nuts to the specified value in the torque chart in Suspension & Steering .
  10.  

INSPECTION



See Figure 9



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Fig. Fig. 9: The maximum allowable inside drum diameter is stamped on the outside

Whenever the rear brake drums are removed from the rear hubs, they should be inspected for damage or irregularities. Periodic inspection can help prevent dangerous conditions from developing to the point of personal injury, and can help maintain the quality of the vehicle's driving characteristics.

Refer to the brake specification chart in this section for the model-specific specifications of the brake components.

Measure drum run-out and diameter. If the drum is not to specifications, have the drum resurfaced. All brake drums will show markings of the maximum allowable diameter. All brake drums have markings for MINIMUM allowable thickness. Always use this specification as the minimum allowable thickness or refinishing limit. Refer to a local auto parts store or machine shop if necessary shop where brake drums are resurfaced.

Once the drum is removed from the axle shaft, clean the shoes and springs with a damp rag to remove the accumulated brake dust.


CAUTION
Do not use compressed air to blow brake dust off the linings or other brake system parts. Brake dust may contain asbestos, a known cancer causing agent.

Grease on the shoes can be removed with alcohol or fine sandpaper. After cleaning, examine the brake shoes for glazed, oily, loose, cracked or improperly (unevenly) worn linings. Light glazing is common and can be removed with fine sandpaper. Linings that are worn improperly or below specification (refer to the specification chart) should be replaced. A good "eyeball'' test is to replace the linings when the thickness is the same as or less than the thickness of the metal backing plate (shoe).

Wheel cylinders are a vital part of the brake system and should be inspected carefully. Gently pull back the rubber boots; if any fluid is visible, it's time to replace the wheel cylinders. Boots that are distorted, cracked or otherwise damaged, also point to the need for service. Check the flexible brake lines for cracks, chafing or wear.

Check the brake shoe retracting and hold-down springs; they should not be worn or distorted. Be sure that the adjuster mechanism moves freely. The points on the backing plate where the shoes slide should be shiny and free of rust. Rust in these areas suggests that the brake shoes are not moving properly.

 
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