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    2009 Buick Truck Enclave AWD 3.6L SFI DOHC 6cyl

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    1980 HARLEM AVE
    (708) 442-6770

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    GM: Electra/Park Avenue/Ninety-Eight 1990-1993

    Brake Shoes

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    CAUTION
    Brake shoes 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! The first step in brake repairs should be cleaning brake surfaces, using a commercially available brake cleaning fluid.



    Click image to see an enlarged view

    Fig. Fig. 1 Before servicing the rear brakes, clean everything off with brake clean spray



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    Fig. Fig. 2 Brake shoes, springs, and other hardware



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    Fig. Fig. 3 Attach the parking brake lever to the cable



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    Fig. Fig. 4 Install the retractor spring



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    Fig. Fig. 5 Install the parking brake lever to the park brake shoe



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    Fig. Fig. 6 Install the retractor spring to the park brake shoe



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    Fig. Fig. 7 After positioning the star wheel assembly, install the adjuster shoe with the actuator



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    Fig. Fig. 8 Install the actuator spring



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    Fig. Fig. 9 Exploded view of rear brake components-1990 vehicles



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    Fig. Fig. 10 Exploded view of rear brake components-1991-93 vehicles

    INSPECTION



    After removing the brake drum, inspect the brake shoes. If the lining is worn down to within 1 / 32 inch (0.8mm) above the rivet, the shoes must be replaced.

    This figure may disagree with your state's automobile inspection laws. If the brake lining is soaked with brake fluid or grease, it must be replaced, and the cause of the fluid leakage should be repaired. If this is the case, the brake drum should be cleaned with brake clean and sanded with crocus cloth to remove all traces of brake fluid. Clean all grit from the friction surface of the drum before replacing it.

    If the lining is chipped, cracked or otherwise damaged, all must be replaced with a new linings.

    Always replace the brake linings in sets of two on both ends of the axle. Never replace just one shoe or both shoes on one side.

    Check the condition of the shoes, retracting springs and holddown springs for signs of overheating. If the shoes or springs have a slight blue color, this indicates overheating, and replacement of the shoes and springs is recommended. If the wheel cylinders show any signs of failure, they should be replaced or rebuilt as a precaution against future problems.

    REMOVAL & INSTALLATION



    1. Raise and safely support the vehicle. Mark the relation ship of wheel to studs in the bearing flange, for reference during assembly. Remove the tire and wheel.
    2.  
    3. Mark the relation ship of drum to the bearing flange, for reference during assembly. Remove the brake drum assembly. Clean the brake surfaces, using a commercially available brake cleaning fluid.
    4.  
    5. Remove the actuator and the upper return spring with the proper tools.
    6.  
    7. Disconnect the spring connecting link, adjuster actuator and the hold-down washer.
    8.  
    9. On models using with holddown spring retained shoes; remove the hold-down springs and the pins. Disconnect the brake shoes from the parking brake cable. Remove the brake shoe and lining assemblies. Clean and lubricate parts, then proceed to the installation. On models with the one-piece retractor spring continue with Step 6.
    10.  
    11. When removing the retractor spring from either shoe and lining, do not overstretch it.
    12.  
    13. Lift the end of the retractor spring from adjuster shoe and lining. Insert hook end of J-38400 between retractor spring and adjuster shoe web, and pry or twist it to lift end of spring out of the shoe web hole.
    14.  


    CAUTION
    Keep fingers clear of spring to prevent from being pinched.

    1. Pry end of retractor spring toward axle with flat edge of tool J-38400 or equivalent, until spring snaps down off shoe web onto backing plate.
    2.  
    3. Remove adjuster shoe and lining, adjuster actuator and adjusting screw assembly
    4.  
    5. Remove parking brake lever from parking brake shoe and lining. Do not remove parking brake cable from park brake lever, unless brake lever is going to be replaced.
    6.  
    7. Lift the end of the retractor spring from park brake shoe and lining. Insert hook end of tool between retractor spring and park brake shoe web, and pry or twist the to lift the end of spring out of the shoe web. Keep fingers clear.
    8.  
    9. Pry the end of the retractor spring toward axle with flat edge of tool until spring snaps down off shoe web onto backing plate.
    10.  
    11. Remove the brake shoe and lining assemblies. Clean and lubricate parts, if only shoes are being replaced you don't have to take off the retractor spring.
    12.  

    To install:

    1. If the one piece retractor spring was removed, install it by hooking the center of spring section under tab on anchor.
    2.  
    3. Install the brake shoe and lining assemblies.
    4.  
    5. Connect the brake shoes to the parking brake cable. Install the brake shoe hold-down pins and springs or pry end of retractor spring into place on shoe.
    6.  
    7. Connect the hold-down washer, adjuster actuator and spring connecting link.
    8.  
    9. Install the upper return springs and actuator.
    10.  
    11. Adjust brake shoes to fit the drum, then install the brake drum.
    12.  
    13. Install the tire and wheel assembly.
    14.  
    15. Lower the vehicle and road test.
    16.  

     
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