# Air in breaks?

**URL:** <https://community.cartalk.com/t/air-in-breaks/4414>\
**Category:** Maintenance/Repairs\
**Created:** [September 10, 2007, 5:16pm UTC](https://community.cartalk.com/t/air-in-breaks/4414 "2007-09-10T17:16:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Kristin713](https://avatars.discourse-cdn.com/v4/letter/k/ecccb3/32.png) [@Kristin713](https://community.cartalk.com/u/Kristin713)\
**Post date:** [September 10, 2007, 5:16pm UTC](https://community.cartalk.com/t/air-in-breaks/4414/1 "2007-09-10T17:16:52Z")

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Lately when I have been breaking there has been an odd sound, almost like air escaping. What could cause this noise, is this a serious problem?

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**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [September 10, 2007, 5:20pm UTC](https://community.cartalk.com/t/air-in-breaks/4414/2 "2007-09-10T17:20:31Z")

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The power booster in your brake system is operated by VACUUM from the engine. If there is a vacuum leak you may hear a sound like air escaping.

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**Author:** ![jezza64](https://avatars.discourse-cdn.com/v4/letter/j/b5a626/32.png) [@jezza64](https://community.cartalk.com/u/jezza64)\
**Post date:** [September 10, 2007, 6:51pm UTC](https://community.cartalk.com/t/air-in-breaks/4414/3 "2007-09-10T18:51:44Z")

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Or you are driving a large truck 🙂