# 97 GMC Sierra Hissing Brakes

**URL:** <https://community.cartalk.com/t/97-gmc-sierra-hissing-brakes/22291>\
**Category:** Maintenance/Repairs\
**Created:** [November 19, 2008, 7:33pm UTC](https://community.cartalk.com/t/97-gmc-sierra-hissing-brakes/22291 "2008-11-19T19:33:23Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ck1416](https://avatars.discourse-cdn.com/v4/letter/c/8baadc/32.png) [@ck1416](https://community.cartalk.com/u/ck1416)\
**Post date:** [November 19, 2008, 7:33pm UTC](https://community.cartalk.com/t/97-gmc-sierra-hissing-brakes/22291/1 "2008-11-19T19:33:23Z")

</div>

I have a 1997 GMC Sierra pickup that hisses when I depress the brake pedal. It sounds like the sounds is coming from under the dash and the pedal sometimes is hard to depress. What might be causing this?