How do I Install a Brake Booster on a 1993 Mazda MX-3?

The brake booster on a 1993 Mazda MX-3 converts the vacuum created by the engine into energy for the braking system. When the brake booster develops a leak, the booster won't function correctly, and it will become very difficult to stop the car. To fix the problem, you have to remove the booster and install a new one on the firewall. The job should take you around two hours to do correctly.

Instructions

1

Pop the hood. Remove the cap on the master cylinder, which is on the driver's side of the firewall. Siphon out the brake fluid from the master cylinder with the siphon. Unplug the wiring on the master cylinder, then remove the brake lines from the master cylinder with a line wrench. Unbolt the master cylinder from the booster with an open-end wrench and move the master cylinder away from the car.

2

Pull off the check valve and vacuum line from the booster with your hands. Move to the underside of the dash. Take out the cotter pin on the clevis pin connecting the booster linkage to the brake pedal with your hands. Pull the clevis pin out as well. Unbolt the brake booster from the firewall with the 3/8-inch ratchet, extension and sockets and the 3/8-inch universal joint. Pull the booster off of the firewall.

3

Install the replacement booster onto the firewall with the 3/8-inch ratchet, extension, sockets and universal joint. Insert the clevis to connect the linkage to the brake pedal, then insert the cotter pin to lock the clevis in place. Install the master cylinder onto the booster with an open-end wrench.

4

Install the master cylinder bleeding kit onto the brake line fittings on the master cylinder. Run the tubes from the kit up from the fittings into the master cylinder bowl. Fill the master cylinder with brake fluid. Have your assistant pump the brakes until no bubbles appear from the master cylinder.

5

Remove the master cylinder bleeding kit and install the brake lines with a line wrench. Plug in the wiring to the master cylinder. Push the vacuum line and check valve onto the replacement booster.