Jeep CJ 1945-1970 Repair Information

Wheel Cylinders

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CAUTION
Brake linings may contain asbestos. Asbestos is a known cancer-causing agent. When working on brakes, remember that the dust which accumulates on the brake parts and/or in the drum contains asbestos. Always wear a protective face covering, such as a painter's mask, when working on the brakes. NEVER blow the dust from the brakes or drum! There are solvents made for the purpose of cleaning brake parts. Use them!


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.

REMOVAL & INSTALLATION



See Figures 1 and 2



Click image to see an enlarged view

Fig. Fig. 1: Loosen, but do not yet remove, the wheel cylinder retaining fasteners ...



Click image to see an enlarged view

Fig. Fig. 2: ... then detach the brake line from the wheel cylinder

  1. Raise and safely support the vehicle on jackstands and remove the wheel, hub, and drum.
  2.  
  3. Loosen, but do not remove, the screws or nuts which hold the wheel cylinder to the backing plate.
  4.  
  5. Disconnect the brake line at the fitting on the brake backing plate.
  6.  
  7. Remove the brake assemblies, as described earlier in this section.
  8.  
  9. Remove the wheel cylinder retaining fasteners, then remove the wheel cylinder from the backing plate.
  10.  
  11. Installation is the reverse of the removal procedure. Tighten the wheel cylinder-to-backing plate fasteners to 18 ft. lbs. (25 Nm) and the brake line-to-wheel cylinder connection to 160 inch lbs. (18 Nm).
  12.  

OVERHAUL



See Figure 3



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the wheel cylinder used on all Jeep models

Wheel cylinder rebuilding kits are available for reconditioning wheel cylinders. The kits usually contain new cup springs, cylinder cups and, in some cases, new boots. The most important factor to keep in mind when rebuilding wheel cylinders is cleanliness. Keep all dirt away from the wheel cylinders when you are reassembling them.

  1. Remove the wheel cylinder, as described earlier in this section.
  2.  
  3. Remove the rubber dust covers on the ends of the cylinder.
  4.  
  5. Remove the pistons and piston cups and the spring.
  6.  
  7. Remove the bleeder screw and make certain that it is not plugged.
  8.  
  9. Discard all of the parts that the rebuilding kit will replace.
  10.  
  11. Examine the inside of the cylinder. If it is severely rusted, pitted or scratched, then the cylinder must be replaced as the piston cups will not be able to seal against the walls of the cylinder.
  12.  
  13. Using emery cloth or crocus cloth, polish the inside of the cylinder. Do not polish in a lengthwise direction. Polish by rotating the wheel cylinder around the polishing cloth supported on your fingers. The purpose of this is to put a new surface on the inside of the cylinder. Keep the inside of the cylinder coated with brake fluid while polishing.
  14.  

Honing the wheel cylinders is not recommended due to the possibility of removing too much material from the bore, making it too large to seal.

  1. Wash out the cylinder with clean brake fluid after polishing.
  2.  
  3. When reassembling the cylinder dip all of the parts in clean brake fluid.
  4.  
  5. Reassemble the wheel cylinder in the reverse order of removal.
  6.  
  7. Install the wheel cylinder.
  8.  

 
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