# Brake Pedal/RPM's

**URL:** <https://community.cartalk.com/t/brake-pedal-rpms/56969>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, trailblazer\
**Created:** [October 30, 2010, 12:09am UTC](https://community.cartalk.com/t/brake-pedal-rpms/56969 "2010-10-30T00:09:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![LauraP](https://avatars.discourse-cdn.com/v4/letter/l/e79b87/32.png) [@LauraP](https://community.cartalk.com/u/LauraP)\
**Post date:** [October 30, 2010, 12:09am UTC](https://community.cartalk.com/t/brake-pedal-rpms/56969/1 "2010-10-30T00:09:10Z")

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Sometimes when I am at a stop light the engine in my 2002 Chevy Trailblazer seems to lose rpm’s, shudder and the brake pedal moves down a little bit. Any ideas what might cause that?

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [October 30, 2010, 12:13am UTC](https://community.cartalk.com/t/brake-pedal-rpms/56969/2 "2010-10-30T00:13:04Z")

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You might have your power brake booster, a vacuum device, checked for a leak…

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**Author:** ![LauraP](https://avatars.discourse-cdn.com/v4/letter/l/e79b87/32.png) [@LauraP](https://community.cartalk.com/u/LauraP)\
**Post date:** [October 30, 2010, 12:15am UTC](https://community.cartalk.com/t/brake-pedal-rpms/56969/3 "2010-10-30T00:15:46Z")

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Ok, Thank You!

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**Author:** ![EllyEllis](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@EllyEllis](https://community.cartalk.com/u/EllyEllis)\
**Post date:** [October 30, 2010, 2:33am UTC](https://community.cartalk.com/t/brake-pedal-rpms/56969/4 "2010-10-30T02:33:43Z")

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Yes, you probably have a vacuum leak, most likely in the brake booster.