Nissan Z - ZX 1970-1988 Repair Guide

Wheel Cylinders

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REMOVAL & INSTALLATION



1970-76 Models

See Figures 1 and 2

  1. Refer the the Rear Brake Shoe removal and installation procedures in this section, and remove the brake shoes.
  2.  
  3. Disconnect the brake line (1) and remove the dust cover (2).
  4.  
  5. Drive out the locking shim (3) toward the front and remove the other shim by pulling it to the rear.
  6.  
  7. Remove the wheel cylinder.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Wheel cylinder components-1970-76 models



Click image to see an enlarged view

Fig. Fig. 2: Measure the wheel cylinder sliding resistance

  1. To install the wheel cylinder, perform the following:
    1. Apply grease to the cylinder, the backing plate, the shims and the wheel cylinder lever fulcrum.
    2.  
    3. Place the cylinder into position and install shims in reverse of the removal procedure. Install the dust cover.
    4.  
    5. Measure the sliding resistance of the cylinder with a spring scale. It should be 4.41-15.43 lbs. (2-7 kg).
    6.  
    7. Connect the brake line.
    8.  
    9. Refer the the Rear Brake Shoe removal and installation procedures in this section, and install the brake shoes.
    10.  
    11. Bleed the hydraulic system and adjust the adjuster.
    12.  

  2.  

1977-78 Models

  1. Refer the the Rear Brake Shoe removal and installation procedures in this section, and remove the brake shoes.
  2.  
  3. Remove and plug the brake line. Use a flare nut wrench, if possible.
  4.  
  5. Remove the wheel cylinder retaining bolts and the wheel cylinder.
  6.  
  7. To install, reposition the wheel cylinder and install the retaining bolts.
  8.  
  9. Install the brake line.
  10.  
  11. Refer the the Rear Brake Shoe removal and installation procedures in this section, and install the brake shoes.
  12.  
  13. Bleed the brake system.
  14.  

OVERHAUL



This is one of those jobs where is is usually easier to just replace the part rather than rebuild it. Rebuilding kits contain all the parts of a wheel cylinder except the body and piston.

Datsun/Nissan has two suppliers of wheel cylinder parts: Nabco and Tokico. The parts are not interchangeable. Be sure to get the correct rebuilding kit for the parts on your vehicle. The name of the manufacturer is stamped on the wheel cylinder.

  1. Remove the wheel cylinder from the backing plate.
  2.  
  3. Remove the dust boots and the pistons. Discard the piston cup. The dust boots can be reused (if necessary) but it is better to replace them.
  4.  
  5. Wash all of the components in clean brake fluid.
  6.  
  7. Inspect the piston and piston bore. Replace them if corroded, scored or worn. The piston and bore can be polished lightly with crocus cloth. Move the crocus cloth around the piston bore, not in and out.
  8.  
  9. Wash the wheel cylinder and piston thoroughly in clean brake fluid, allowing them to remain wet for assembly. Lubricate the piston cups and dust seals with brake fluid.
  10.  
  11. Apply rubber grease sparingly to the inside of the dust boot lip.
  12.  
  13. Assemble the wheel cylinder as outlined in the rebuilding kit. Install the wheel cylinder as outlined earlier and bleed the brakes.
  14.  

 
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