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How to Check Leaks for Power Brake Boosters The automobile's brake booster's main function is to give the vehicle maximum braking power with minimal pressure applied to the brake pedal. The brake booster primarily functions on the vacuum system of the vehicle. If the vacuum system is working properly, the booster pushes into the master cylinder when pressure is applied to the brake pedal, allowing the car to come to a stop. If there is an issue with the vacuum system, the car will still have brakes, but it will take a much greater effort on the pedal to stop the vehicle. Instructions Get into the car and start the engine. Without applying any pressure to the brake pedal, allow the car to idle for 60 seconds. Turn the engine off after the one-minute idling time has passed, and allow the car to rest with the engine off for an additional minute. Push on the brake pedal and release several times. If the vehicle's vacuum system is working properly, each push of the br...

How to Replace the Break Booster on a Chevrolet Silverado The Chevy Silverado´s braking system operates with disc brakes, which require the use of power brake boosters. Prior to disc brakes, stopping a truck required much more effort compared to the modern systems that take advantage of a vacuum created by the truck´s engine. Just like any truck part, the brake booster undergoes normal wear and tear and can lose its capacity to assist in braking. When this occurs, it is time to replace the brake booster and regain your truck´s braking ability. Things You'll Need Socket wrench Flashlight Screwdriver Instructions Lift the hood of the truck and locate the master brake cylinder -- it is located on the firewall, opposite of where the brake pedal is in the cabin of the truck. You can identify the master brake cylinder by the brake lines that are attached to it; these brake lines run from the brake linkage through the truck´s firewall and connect the brake booster to the m...