Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

Wheel Cylinders

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REMOVAL & INSTALLATION



See Figures 1 through 6

  1. Remove the brake drums and shoes as described previously. Although some vehicles will allow the cylinder to be removed with the brake shoes in place, this is not recommended. Chances are good that the brake shoes will become soaked with brake fluid. Contaminated brake shoes will need replacement so you'll have to take them off anyway.
  2.  
  3. Place a drain pan under the work area and disconnect the brake line at its connection to the wheel cylinder (behind the backing plate). Plug the open end of the brake line.
  4.  

Work carefully and use a line wrench on the fitting. This fitting is usually rusted or otherwise difficult to turn. Don't damage the brake line.

  1. Remove the two bolts that fasten the wheel cylinder to the backing plate and remove the wheel cylinder. Again, these bolts may be harder than usual to turn.
  2.  
  3. Install the cylinder and tighten the mounting bolts to 13 ft. lbs. (18 Nm). This is just enough to hold the cylinder in place; overtightening will strip the bolt holes.
  4.  
  5. Connect the brake line to the cylinder.
  6.  
  7. Install the shoes and drums correctly. Make sure the self-adjusters have taken up play so the brakes actuate normally.
  8.  
  9. Bleed the system thoroughly before operating the vehicle.
  10.  



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Fig. Fig. 1: Using a line wrench, carefully disconnect the brake line from the back of the wheel cylinder



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Fig. Fig. 2: Slightly pull the brake line away from the backing plate-DO NOT BEND THE PIPE



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Fig. Fig. 3: Plug the line and remove the wheel cylinder mounting bolts



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Fig. Fig. 4: Remove the wheel cylinder from the backing plate to rebuild or replace with a new unit



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Fig. Fig. 6: Top off the system with fresh brake fluid

OVERHAUL



See Figures 7 through 16

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.
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Fig. Fig. 7: 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.  
  3. Wash the cylinder and metal parts in denatured alcohol or clean brake fluid.
  4.  



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Fig. Fig. 8: Compressed air can be used to remove the pistons and seals



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Fig. Fig. 9: Remove the pistons, cup seals and spring from the cylinder



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Fig. Fig. 10: Use brake fluid and a soft brush to clean the pistons



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Fig. Fig. 11: and the bore of the wheel cylinder



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Fig. Fig. 12: Once cleaned and inspected, the wheel cylinder is ready for assembly



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Fig. Fig. 13: Lubricate the cup seals with brake fluid



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Fig. Fig. 14: Install the spring, then the cup seals in the bore



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Fig. Fig. 15: Lightly lubricate the pistons, then install them


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.



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Fig. Fig. 16: The boots can now be installed over the wheel cylinder ends

  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.  
  5. Lubricate the cylinder bore and seals using clean brake fluid.
  6.  
  7. Position the spring assembly.
  8.  
  9. Install the inner seals, then the pistons.
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  11. Insert the new boots into the counterbores by hand. Do not lubricate the boots.
  12.  
  13. Install the wheel cylinder.
  14.  
  15. Bleed the system thoroughly before operating the vehicle.
  16.  

 
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