# Surging rpms when braking

**URL:** <https://community.cartalk.com/t/surging-rpms-when-braking/84995>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, colorado\
**Created:** [May 12, 2014, 11:25pm UTC](https://community.cartalk.com/t/surging-rpms-when-braking/84995 "2014-05-12T23:25:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RJMTexag](https://avatars.discourse-cdn.com/v4/letter/r/5f9b8f/32.png) [@RJMTexag](https://community.cartalk.com/u/RJMTexag)\
**Post date:** [May 12, 2014, 11:25pm UTC](https://community.cartalk.com/t/surging-rpms-when-braking/84995/1 "2014-05-12T23:25:21Z")

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I have a 2007 Chev Colorado PU (automatic) and whenever I use the brake to come to a stop my rpms surge from 500 to 1000 - both visualy on the tach and you can feel it also. When the truck is stoped it returns to noral (750). accelerates fine - shifts fine - fuel economy is a bit down.

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [May 12, 2014, 11:31pm UTC](https://community.cartalk.com/t/surging-rpms-when-braking/84995/2 "2014-05-12T23:31:03Z")

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Have your mechanic check the power brake booster.  
My best guess is that you have a vacuum leak in the booster.

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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:** [May 12, 2014, 11:44pm UTC](https://community.cartalk.com/t/surging-rpms-when-braking/84995/3 "2014-05-12T23:44:45Z")

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Remove and cap the vacuum line from the brake booster and step on the brake. If there is no surging the booster has a leaking control valve. There are no DIY repairs for boosters. Any failure requires replacement.