Brake Booster Leak

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The hydraulic brake booster is bolted behind your hydraulic master cylinder under the hood of your car. Learn how to fix a brake booster leak with help from an expert in the automotive industry in this free video on auto repair.

Part of the Video Series: Auto Repair Tips
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Video Transcript

Hi, I'm Bob Holcomb from Apex Automotive in Great Barrington, Massachusetts. Today, we're going to talk about your hydraulic brake booster. This device is bolted behind your hydraulic master cylinder. The master cylinder is connected to your brake pedal. When you apply your brake it pushes a rod against the master cylinder. This rod is in between the master cylinder and your brake pedal. The rod runs through the brake booster. As the engine runs, a vacuum is generated and pulls against a large diaphragm on the back side of your master cylinder. When you apply brake, the diaphragm or the vacuum from the engine also pulls forward. It allows you put a little bit of energy on your brake pedal but a whole bunch of energy goes to your brakes. That's why it's easy to stop your car with a vacuum assist hydraulic brake system. If you should have a leak in your system you'll here a distinct whistling noise, a vacuum leak. It sounds like a vacuum cleaner but in reverse, you'll hear a hissing sound and this could be a brake booster leaking, typically you'll hear it when you're driving the car, they do make a lot of noise and they hold a lot of vacuum. The brake booster is about this big and it's a reservoir for vacuum. There's a one way valve between the brake booster and your engine. As your engine turns it pulls air out of the booster and that one way valve doesn't allow it to go back in. If you look at your booster and underneath the booster between the vacuum assist booster and the hydraulic master cylinder, if you see fluid that's a bad sign and that'll need to be addressed right away, if that's a leak in your brake system right at the booster. These are a couple quick tips about how to tell if you have a bad brake booster. I'm Bob Holcomb from Apex Automotive in Great Barrington, Massachusetts.


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