# 2017 Toyota Tundra revs up while braking **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** toyota, tundra\ **Created:** [May 16, 2021, 5:10pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848 "2021-05-16T17:10:36Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![sandman34](https://avatars.discourse-cdn.com/v4/letter/s/a6a055/32.png) [@sandman34](https://community.cartalk.com/u/sandman34)\ **Post date:** [May 16, 2021, 5:10pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/1 "2021-05-16T17:10:36Z")
2017 tundra TRD SR5 5.7 during braking it will rev up 1000-1500 rpm it has done this a few times. the truck has 33k on it now i just got it from a dealer with 32,632 miles. last month ---
**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\ **Post date:** [May 16, 2021, 5:46pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/2 "2021-05-16T17:46:02Z")
when you say it does it when braking, do you mean at idle with your foot on the brake? or rolling coming to a stop? also did you get any used car warranty from the dealer? usually get 3 or 6 months I think. if so bring it back and let them check it out. ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [May 16, 2021, 9:02pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/3 "2021-05-16T21:02:13Z")
I’m not a mechanic but it sounds like you might have a vacuum leak. The brake booster is operated by vacuum and stepping on the brake pedal could trigger the increase in engine speed. ---
**Author:** ![sandman34](https://avatars.discourse-cdn.com/v4/letter/s/a6a055/32.png) [@sandman34](https://community.cartalk.com/u/sandman34)\ **Post date:** [May 17, 2021, 10:03pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/4 "2021-05-17T22:03:32Z")
no if you have a vacume leak it would idle high. this is something with the fly by wire / ecm thats why i was checking if it happened to some other tundra it might be a software issue. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [May 17, 2021, 10:19pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/5 "2021-05-17T22:19:08Z")
> [@sandman34](#): > > if it happened to some other tundra it might be a software issue. Not that you can’t get real help here but to actually get replies from Tundra owners you should try to find a forum just for Tundra. ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [May 19, 2021, 1:36am UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/6 "2021-05-19T01:36:30Z")
> [@sandman34](#): > > no if you have a vacume leak it would idle high. You ARE reporting a high idle! What I think @davepsinbox_157004 is getting at is a vacuum leak in the brake booster that only happens when you step on the brake. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [May 19, 2021, 3:01am UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/7 "2021-05-19T03:01:46Z")
A faulty brake booster sensor can cause the engine to rev when braking. ![image](https://global.discourse-cdn.com/cartalk/original/3X/3/b/3b1f7bc3224bd775dd0530979986d6eecee46401.jpeg) Tester ---
**Author:** ![eddo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/eddo/32/2594_2.png) [@eddo](https://community.cartalk.com/u/eddo)\ **Post date:** [May 19, 2021, 4:08pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/8 "2021-05-19T16:08:20Z")
> [@](#): > > A faulty brake booster sensor can cause the engine to rev when braking. So will stepping on both pedals at the same time. New shoes, certain medical conditions, or not being very familiar with a new vehicle can cause this. @sandman34, be positive this isn’t happening (it seems unlikely, but it can happen.) ---
**Author:** ![sandman34](https://avatars.discourse-cdn.com/v4/letter/s/a6a055/32.png) [@sandman34](https://community.cartalk.com/u/sandman34)\ **Post date:** [May 19, 2021, 11:15pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/9 "2021-05-19T23:15:44Z")
yes they have it now. during breaking it would rev up for a few seconds /2017 tundra so i guess they are updating software thank s for you input ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [May 19, 2021, 11:17pm UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/10 "2021-05-19T23:17:16Z")
> [@sandman34](#): > > breaking Braking … ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [May 20, 2021, 12:04am UTC](https://community.cartalk.com/t/2017-toyota-tundra-revs-up-while-braking/176848/11 "2021-05-20T00:04:35Z")
> [@NYBo](#): > > You ARE reporting a high idle! What I think @davepsinbox_157004 is getting at is a vacuum leak in the brake booster that only happens when you step on the brake. Thanks, yes. That’s what I had in mind. Sorry I wasn’t more clear. When the OP dismissed the idea there didn’t seem to be much point in clarifying so I let it drop.