brakeeA brake booster is a critical part of many braking systems. It magnifies the slowing or stopping force of the existing brake system, making it more powerful and more efficient. To have a brake booster go bad basically equates to having the entire mechanism go out, as the remainder of the system is designed to have the booster in place. Changing  the booster isn’t a difficult thing; if you can change your brake pads and bleed your brakes, you can change the booster. It isn’t usually an expensive part too. Here, you will see all the information needed on how to change this part.

Locate the Brake Booster

This component is located adjacent to the master cylinder. There will be four mounting screws coming through it to secure it in place. The booster is also linked to the brake pedal in the interior of the car. This is where you will begin.

Take out the Brake Booster

The booster will be linked to the brake pedal with a piece called a booster rod. This passes through the firewall and is typically secured to the pedal with a cotter pin. There will also be nuts. Remove the fasteners, irrespective of what they are, and put them aside in a plastic bag. Your new brake booster will not come with replacement fasteners, so it’s vital that you keep these.

Slide the rod off the brake pedal. Then, disconnect the vacuum brake line that links to the booster. In the engine compartment, four bolts will secure the booster to the master cylinder and firewall. Loosen and take this out. There are usually two more in addition to these four that will secure the brake booster to the master cylinder; these should also be taken out. Wiggle the brake booster away from the master cylinder once it’s free. There will be a seal between the two that you need to keep as well, as the new part does not generally come with another one. Lastly, remove the brake booster completely.

Mount the New Brake Booster

Put the new brake booster on the four mounting screws, and tighten the nuts on the bolts to the master cylinder. Begin these by hand so that the threads are not spoilt. Then, insert the push rod through the firewall, and re-attach the vacuum hose. Secure the nuts to the four mounting screws, and then lastly reattach the push rod to the brake pedal by whatever means it was originally secured with, whether by cotter pin or by bolts.


You will have to bleed the brakes after replacing the brake booster. Once this is completely, your break system should be fixed and ready to go!