How to Repair a Brake Booster

January 27, 2012

The brake booster is a vacuum-powered part that helps the ABS system apply the appropriate amount of pressure necessary for the brakes to work. When the brake booster looses power, it should be replaced immediately in order for the ABS brakes to continue to work.

If you insist on engaging in the replacement of your ABS brake boosters instead of hiring a qualified mechanic follow the guidelines below:

Tools and Materials Needed:

  • Socket wrench
  • Tube nut wrench
  • Pliers
  • Replacement brake booster
  • Tape and a marker

Step 1: Remove the Brake Lines

Use the tube nut wrench to locate and remove the brake lines from the back of the master cylinder. The master cylinder is located in the front of the car on the driver's side. Place the tube nut on the back of the master cylinder over the brake line and turn counterclockwise. Mark the location of each brake line that you remove in order to make them easy to identify when installing the replacement brake booster.

Step 2: Remove the Master Cylinder

Once you remove the brake lines, remove the master cylinder from the housing using a socket wrench.  Free the master cylinder completely and place it on a dry, clean surface. Inspect the master cylinder to make sure everything is ok.

Step 3: Remove the Brake Booster

The brake booster must be disconnected from the brake pedal.  Use pliers to remove the cotter pin that holds the booster diaphragm to the break pedal. Use the socket to remove the bolts holding the brake booster to the engine and remove it completely from the car.

Step 4: Install the Replacement Brake Booster

Take the replacement brake booster and insert in place of the old brake booster. Screw the brake booster in place and connect the replacement brake booster to the diaphragm and brake pedal. Reverse the steps for the rest of the installation with the master cylinder and the brake lines.

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