How do you replace the brake booster of 1986 Nissan z24 engine?

Answer 1

Vacuum boosters can be found only on models equipped with power brakes.

REMOVAL & INSTALLATION

See Figure 1

1. Remove the master cylinder as previously detailed.
2. Locate the clevis rod where it attaches to the brake pedal. Pull out the clip and then remove the clevis pin.
3. Disconnect the vacuum hose from the booster.
4. Loosen the four nuts and then pull out the vacuum booster, the bracket and the gasket.

Some 4wd models may have two extra brackets that must be removed when removing the brake booster.

To install:

1. Install the booster and tighten the mounting bolts to 6-8 ft. lbs. (0.8-1.1 Nm).
2. Connect the clevis rod to the brake pedal.
3. Install the master cylinder. Check the brake pedal adjustment and bleed the brakes.

4. The sequence for bleeding is as follows:

   1980-86 (720D series): NLSV, rear wheels, front wheels.1986-88 (D21-D series) equipped with LSV: LSV air bleeder, left rear wheel cylinder, right rear wheel cylinder, left front caliper, right front caliper.1986-88 (D21-D series) not equipped with LSV: left rear wheel cylinder, right rear wheel cylinder, left front caliper, right front caliper.

   1. Clean all the bleeder screws. You may want to give each one a shot of a penetrating lubricant to loosen it up; seizure is a common problem with bleeder screw, which then break off, sometimes requiring replacement of the part to which they are attached.
   2. Fill the master cylinder with DOT 3 brake fluid.

   Brake fluid picks up moisture from the air. Don't leave the master cylinder or the fluid container uncovered any longer than necessary. Be careful! Brake fluid eats paint.Check the level of the fluid often when bleeding, and refill the reservoirs as necessary. Don't let them run dry, or you will have to repeat the process.

   Attach a length of clear vinyl tubing to the bleeder screw on the wheel cylinder (or master cylinder). Insert the other end of the tube into a clear, clean jar half filled with brake fluid.

5. Have you helper slowly depress the brake pedal. As this is done, open the bleeder screw 1 / 3 - 1 / 2 of a turn, and allow the fluid to run through the tube. Then close the bleeder screw before the pedal reaches the end of its travel. Have you assistant slowly release the pedal. Repeat this process until no air bubbles appear in the expelled fluid.

6. If the brake pedal is depressed too fast, small air bubbles will form in the brake fluid.

   1. Repeat the procedure on the other three brakes, checking the level of fluid in the cylinder reservoirs often.