MonteCarlo 2000

Wheel Cylinders

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Overhaul



Specific to:

Buick Century 1997-2000

Buick Regal 1997-2000

Chevrolet Lumina 1997-2000

Chevrolet Monte Carlo 1997-2000

Oldsmobile Cutlass Supreme 1997

Oldsmobile Intrigue 1998-2000

Wheel cylinder overhaul kits may be available, but often at little or no savings over a reconditioned wheel cylinder. It often makes sense with these components to substitute a new or reconditioned part instead of attempting an overhaul.

If no replacement is available, or you would prefer to overhaul your wheel cylinders, the following procedure may be used. When rebuilding and installing wheel cylinders, avoid getting any contaminants into the system. Always use clean, new, high quality brake fluid. If dirty or improper fluid has been used, it will be necessary to drain the entire system, flush the system with proper brake fluid, replace all rubber components, then refill and bleed the system.

  1. Remove the wheel cylinder from the vehicle and place on a clean workbench.
  2.  
  3. First remove and discard the old rubber boots, then withdraw the pistons. Piston cylinders are equipped with seals and a spring assembly, all located behind the pistons in the cylinder bore.
  4.  



Click image to see an enlarged view

Fig. Remove the outer boots from the wheel cylinder

  1. Remove the remaining inner components, seals and spring assembly. Compressed air may be useful in removing these components. If no compressed air is available, be VERY careful not to score the wheel cylinder bore when removing parts from it. Discard all components for which replacements were supplied in the rebuild kit.
  2.  



Click image to see an enlarged view

Fig. Compressed air can be used to remove the pistons and seals



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Fig. Remove the pistons, cup seals and spring from the cylinder

  1. Wash the cylinder and metal parts in denatured alcohol or clean brake fluid.
  2.  



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Fig. Use brake fluid and a soft brush to clean the pistons . . .



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Fig. . . . and the bore of the wheel cylinder


WARNING
Never use a mineral-based solvent such as gasoline, kerosene or paint thinner for cleaning purposes. These solvents will swell rubber components and quickly deteriorate them.

  1. Allow the parts to air dry or use compressed air. Do not use rags for cleaning, since lint will remain in the cylinder bore.
  2.  
  3. Inspect the piston and replace it if it shows scratches.
  4.  



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Fig. Exploded view of the wheel cylinder components



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Fig. Once cleaned and inspected, the wheel cylinder is ready for assembly

  1. Lubricate the cylinder bore and seals using clean brake fluid.
  2.  
  3. Position the spring assembly.
  4.  
  5. Install the inner seals, then the pistons.
  6.  



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Fig. Lubricate the cup seals with brake fluid



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Fig. Install the spring, then the cup seals in the bore



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Fig. Lightly lubricate the pistons, then install them

  1. Insert the new boots into the counterbores by hand. Do not lubricate the boots.
  2.  



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Fig. The boots can now be installed over the wheel cylinder ends

  1. Install the wheel cylinder.
  2.  

Removal & Installation



Specific to:

Buick Century 1997-2000

Buick Regal 1997-2000

Chevrolet Lumina 1997-2000

Chevrolet Monte Carlo 1997-2000

Oldsmobile Cutlass Supreme 1997

Oldsmobile Intrigue 1998-2000



Click image to see an enlarged view

Fig. The wheel cylinder is mounted to the brake backing plate

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the rear tire and wheel assembly.
  4.  
  5. Remove the brake drum, as outlined earlier in this section.
  6.  
  7. Using tool J-38400, or an equivalent brake spanner and remover, remove the actuator spring from the adjuster lever. Use care not to distort the spring when removing it.
  8.  


NOTE
During the following steps when removing the retractor spring from either shoe and lining assembly, do not over stretch the spring. This will reduce its effectiveness.


CAUTION
Keep fingers away from retractor spring to prevent fingers from being pinched between the spring and shoe web or spring and the backing plate.

  1. Remove the bleeder screw to gain access to the brake line.
  2.  
  3. Disconnect and cap or plug the wheel cylinder brake line to prevent fluid loss and/or brake system contamination.
  4.  
  5. Spread the upper half of the brake shoes and remove the wheel cylinder retaining bolts and remove the wheel cylinder.
  6.  

To install:

  1. Apply Loctite® Master Gasket Maker or equivalent sealer to the wheel cylinder shoulder face that contacts the backing plate.
  2.  
  3. Position the wheel cylinder assembly on the backing plate and hold into place.
  4.  
  5. Install attaching bolts and tighten to 110 inch lbs. (12 Nm).
  6.  
  7. Connect the brake line to the wheel cylinder. Tighten to 12 ft. lbs. (17 Nm).
  8.  
  9. Bleed the wheel cylinder using the recommended procedure.
  10.  
  11. Tighten the bleeder valve to 62 inch lbs. (7 Nm). Do not overtighten.
  12.  
  13. Clean all the brake spring completely with brake solvent and allow to air dry.
  14.  
  15. Install the actuator spring and adjust the brake shoes.
  16.  
  17. Install the brake drum, then the tire and wheel assembly.
  18.  
  19. Add DOT 3 brake fluid to the master cylinder if needed and road test to verify proper brake system performance.
  20.  

 
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