# Thumping Hyundai

**URL:** <https://community.cartalk.com/t/thumping-hyundai/77016>\
**Category:** Maintenance/Repairs\
**Tags:** hyundai, sonata\
**Created:** [January 29, 2013, 5:57am UTC](https://community.cartalk.com/t/thumping-hyundai/77016 "2013-01-29T05:57:18Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Hyundai](https://avatars.discourse-cdn.com/v4/letter/h/e19adc/32.png) [@Hyundai](https://community.cartalk.com/u/Hyundai)\
**Post date:** [January 29, 2013, 5:57am UTC](https://community.cartalk.com/t/thumping-hyundai/77016/1 "2013-01-29T05:57:18Z")

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Hello out there!

My parents have a 2010 Hyundai Sonata. About a month ago my mom noticed that when she starts to brake, the car stops fine but then it stops again almost, with a loud thunk. The best way to describe it is that you press down the brake, the car stops, then a few seconds later the car feels like it is lunging forward and stopping again with a sudden thump. (Although I don’t think it really actually moves at all).

Any ideas?

Thank you!

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [January 29, 2013, 6:12am UTC](https://community.cartalk.com/t/thumping-hyundai/77016/2 "2013-01-29T06:12:15Z")

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Check to make sure the spare tire is secured. I fixed a couple of problems like this simply by tightening up the spare.

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [January 29, 2013, 6:42am UTC](https://community.cartalk.com/t/thumping-hyundai/77016/3 "2013-01-29T06:42:58Z")

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Any idea where the noise is coming from? Front or back? Left or right?

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**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:** [January 29, 2013, 10:45am UTC](https://community.cartalk.com/t/thumping-hyundai/77016/4 "2013-01-29T10:45:02Z")

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That sounds like a transmission problem. Get it to the dealer while the drivetrain is still under warranty.

Tester

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**Author:** ![Hyundai](https://avatars.discourse-cdn.com/v4/letter/h/e19adc/32.png) [@Hyundai](https://community.cartalk.com/u/Hyundai)\
**Post date:** [February 1, 2013, 6:00am UTC](https://community.cartalk.com/t/thumping-hyundai/77016/5 "2013-02-01T06:00:41Z")

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Thanks Everyone! I think we are just going to take it to the dealer-- I appreciate all of your suggestions!

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**Author:** ![DocKeystone](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/dockeystone/32/2670_2.png) [@DocKeystone](https://community.cartalk.com/u/DocKeystone)\
**Post date:** [March 18, 2013, 8:11pm UTC](https://community.cartalk.com/t/thumping-hyundai/77016/6 "2013-03-18T20:11:50Z")

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I noticed with my Sonata that the pedals seemed to be very close and the same height. Many times I don’t move my foot far enough to the left and while I am breaking I am still pushing the accelerator. Big feet plus Korean engineer equals not enough room.