Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Master Cylinder

Print


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 and fill 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



1982-90 Vehicles

See Figures 1, 2, 3, 4 and 5



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the master cylinder-1982-84 vehicles



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the master cylinder-1985-86 vehicles



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the master cylinder-1987-90 vehicles



Click image to see an enlarged view

Fig. Fig. 4: Exploded view of the master cylinder-1991-92 Sentra



Click image to see an enlarged view

Fig. Fig. 5: Removing the master cylinder stopper cap

  1. Clean the outside of the master cylinder thoroughly, particularly around the cap and fluid lines.
  2.  
  3. If equipped with a fluid level sensor, disconnect the wiring harness from the master cylinder.
  4.  
  5. Disconnect the brake fluid tubes, then plug the openings to prevent dirt from entering the system.
  6.  
  7. Remove the mounting bolts at the firewall or the brake booster (if equipped) and remove the master cylinder from the vehicle.
  8.  

To install:
  1. Bench bleed the master cylinder by using old brake pipes. Bend the brake pipes around into the reservoir. Place the master cylinder in a vise and fill the reservoir with DOT 3 brake fluid. Pump the piston using a pushrod until all the air bubbles are gone.
  2.  
  3. Install the master cylinder to the vehicle. Connect all brake lines and fluid level sensor wiring is so equipped. Refill the reservoir with brake fluid and bleed the system.
  4.  
  5. Torque the master cylinder nuts to 72-96 inch lbs. (8-11 Nm) and the brake pipe fittings to 12-14 ft. lbs. (17-20 Nm).
  6.  

Use DOT 3 brake fluid in the brake systems.

1991-96 Vehicles
  1. Clean the outside of the master cylinder thoroughly, particularly around the cap and fluid lines.
  2.  
  3. Using a ball type suction device (similar to a turkey baster), remove as much brake fluid from the fluid reservoir as possible.
  4.  
  5. Disconnect the brake fluid tubes, then plug the openings to prevent dirt from entering the system.
  6.  
  7. Remove the nuts securing the master cylinder to the brake booster.
  8.  
  9. Remove the master cylinder from the vehicle.
  10.  


WARNING
When removing the master cylinder from the vehicle, use extreme care not to get any brake any brake fluid onto painted surfaces

To install:
  1. Install the master cylinder onto the booster mounting studs. Secure the master cylinder to the booster with the retaining nuts and tighten the nuts as follows:

    1991-94 vehicles-72-96 lbs. (8-11 Nm)
     
    1995-96 vehicles-9-13 ft. lbs. (15-18 Nm)
     

  2.  
  3. Refill the reservoir using DOT 3 approved brake fluid.
  4.  
  5. Bleed the master cylinder as follows:
    1. Using your fingers, plug both line ports. Cover your hand and the exit ports with a rag to prevent fluid from spraying.
    2.  
    3. Have a helper slowly depress the brake pedal.
    4.  
    5. Before releasing the brake pedal tightly seal both ports using your fingers.
    6.  
    7. Repeat this procedure until air can no longer be heard exiting the ports and only fluid is being released.
    8.  

  6.  
  7. Once the master cylinder has been properly bled, connect both brake lines. Tighten the flare nuts to 11-13 ft. lbs. (15-18 Nm).
  8.  
  9. Bleed the remainder of the brake system following the procedures outlined in the Bleeding Brake System portion of this section.
  10.  

 
label.common.footer.alt.autozoneLogo