# Hissing sound when I depress brake pedal on 1997 S10

**URL:** <https://community.cartalk.com/t/hissing-sound-when-i-depress-brake-pedal-on-1997-s10/5276>\
**Category:** Maintenance/Repairs\
**Tags:** abs, brakes\
**Created:** [September 29, 2007, 5:01pm UTC](https://community.cartalk.com/t/hissing-sound-when-i-depress-brake-pedal-on-1997-s10/5276 "2007-09-29T17:01:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![phoneman550](https://avatars.discourse-cdn.com/v4/letter/p/bc79bd/32.png) [@phoneman550](https://community.cartalk.com/u/phoneman550)\
**Post date:** [September 29, 2007, 5:01pm UTC](https://community.cartalk.com/t/hissing-sound-when-i-depress-brake-pedal-on-1997-s10/5276/1 "2007-09-29T17:01:58Z")

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When holding down the brake I hear a hissing sound. The engine sometimes stalls, especially if I also depress the clutch. The abs lite has always been on.

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**Author:** ![galant](https://avatars.discourse-cdn.com/v4/letter/g/77aa72/32.png) [@galant](https://community.cartalk.com/u/galant)\
**Post date:** [September 29, 2007, 5:41pm UTC](https://community.cartalk.com/t/hissing-sound-when-i-depress-brake-pedal-on-1997-s10/5276/2 "2007-09-29T17:41:22Z")

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It has a vacuum leak somewhere in the lines. Check ASAP.

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**Author:** ![Rod-Knox](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rod-Knox](https://community.cartalk.com/u/Rod-Knox)\
**Post date:** [September 30, 2007, 3:49am UTC](https://community.cartalk.com/t/hissing-sound-when-i-depress-brake-pedal-on-1997-s10/5276/3 "2007-09-30T03:49:13Z")

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Your power brake booster has a ruptured diaphram,