Quest 1995-1996

Wheel Cylinders

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Overhaul



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

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.

    Click image to see an enlarged view

    Fig. Remove the outer boots from the wheel cylinder

  4.  
  5. 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.

    Click image to see an enlarged view

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



    Click image to see an enlarged view

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

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



    Click image to see an enlarged view

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



    Click image to see an enlarged view

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

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  9. Allow the parts to air dry or use compressed air. Do not use rags for cleaning, since lint will remain in the cylinder bore.
  10.  
  11. Inspect the piston and replace it if it shows scratches.

    Click image to see an enlarged view

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

  12.  
  13. Lubricate the cylinder bore and seals using clean brake fluid.
  14.  
  15. Position the spring assembly.
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  17. Install the inner seals, then the pistons.

    Click image to see an enlarged view

    Fig. Lubricate the cup seals with brake fluid



    Click image to see an enlarged view

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



    Click image to see an enlarged view

    Fig. Lightly lubricate the pistons, then install them

  18.  
  19. Insert the new boots into the counterbores by hand. Do not lubricate the boots.

    Click image to see an enlarged view

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

  20.  
  21. Install the wheel cylinder.
  22.  

Removal & Installation



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000


WARNING
Clean, high quality brake fluid is essential to the safe and proper operation of the brake system. You should always buy the highest quality brake fluid that is available. If the brake fluid becomes contaminated, drain and flush the system, then refill the master cylinder with new fluid. Never reuse any brake fluid. Any brake fluid that is removed from the system should be discarded. Also, do not allow any brake fluid to come in contact with a painted surface; it will damage the paint.


CAUTION
Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with the eyes and wash your hands thoroughly after handling brake fluid. If you do get brake fluid in your eyes, flush your eyes with clean, running water for 15 minutes. If eye irritation persists, or if you have taken brake fluid internally, IMMEDIATELY seek medical assistance.

  1. Loosen the lug nuts on the rear wheels.
  2.  
  3. Block the front wheels, then raise and safely support the rear of the vehicle securely on jackstands.
  4.  
  5. Remove the rear wheels.
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  7. Remove the brake drum.
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  9. Remove the brake shoes. Please refer to Brake Shoes, Removal and Installation for the procedure.
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  11. Using a flare nut wrench, disconnect the brake line from the wheel cylinder. Underbody components are subject to rust and corrosion. It is good practice to wire brush the area around the brake line fitting to remove rust. A liberal application of penetrating oil also helps. If the brake line is rusted to the brake line fitting, it may twist off, requiring replacement of the brake line.
  12.  
  13. Remove the two wheel cylinder bolts and remove the cylinder from the brake backing plate.

    Click image to see an enlarged view

    Fig. Disconnecting the brake line from the wheel cylinder



    Click image to see an enlarged view

    Fig. Removing the wheel cylinder bolts

  14.  

To install:

  1. Install the assembled wheel cylinder to the backing plate. Install the bolts and tighten them to 9 - 13 ft. lbs. (12 - 18 Nm).
  2.  
  3. Connect the brake line and tighten it to 11 - 13 ft. lbs. (15 - 18 Nm).
  4.  
  5. Install the brake shoes. If the wheel cylinder was leaking and brake fluid has soaked the linings, the brake shoes must be replaced.
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  7. Install the brake drum.
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  9. Install the wheel and tighten the lug nuts to 72 - 87 ft. lbs. (98 - 118 Nm).
  10.  
  11. Properly bleed the brake system.
  12.  
  13. Lower the vehicle.
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  15. Adjust the rear brake shoes by sharply applying the brakes several times while driving the vehicle alternately forwards and backwards. Check the brake operation by making several stops while driving forward.
  16.  

 
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