# 2002 Toyota Sequoia brakes hiss

**URL:** <https://community.cartalk.com/t/2002-toyota-sequoia-brakes-hiss/118219>\
**Category:** Maintenance/Repairs\
**Tags:** sequoia, toyota\
**Created:** [May 28, 2018, 5:10pm UTC](https://community.cartalk.com/t/2002-toyota-sequoia-brakes-hiss/118219 "2018-05-28T17:10:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![joseph02](https://avatars.discourse-cdn.com/v4/letter/j/a9a28c/32.png) [@joseph02](https://community.cartalk.com/u/joseph02)\
**Post date:** [May 28, 2018, 5:10pm UTC](https://community.cartalk.com/t/2002-toyota-sequoia-brakes-hiss/118219/1 "2018-05-28T17:10:04Z")

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want to know why when i press on break pedal i hear hissing sound.

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**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\
**Post date:** [May 29, 2018, 9:52am UTC](https://community.cartalk.com/t/2002-toyota-sequoia-brakes-hiss/118219/3 "2018-05-29T09:52:09Z")

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I could be wrong but you may have a little bit of air in the system. Take the vehicule to an independant mechanic for an inspection of the brake system.

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**Author:** ![JoeMario](https://avatars.discourse-cdn.com/v4/letter/j/3bc359/32.png) [@JoeMario](https://community.cartalk.com/u/JoeMario)\
**Post date:** [May 29, 2018, 1:10pm UTC](https://community.cartalk.com/t/2002-toyota-sequoia-brakes-hiss/118219/4 "2018-05-29T13:10:53Z")

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My first thought is you have a leak in your power booster.

If you disconnect and plug the vacuum hose feeding the brake booster unit, do you still get the hiss?