# Knocking sounds while braked from my 08 Chevy Cobalt **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, cobalt, brakes\ **Created:** [March 17, 2010, 2:03pm UTC](https://community.cartalk.com/t/knocking-sounds-while-braked-from-my-08-chevy-cobalt/46210 "2010-03-17T14:03:33Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Jeremyjb](https://avatars.discourse-cdn.com/v4/letter/j/b5e925/32.png) [@Jeremyjb](https://community.cartalk.com/u/Jeremyjb)\ **Post date:** [March 17, 2010, 2:03pm UTC](https://community.cartalk.com/t/knocking-sounds-while-braked-from-my-08-chevy-cobalt/46210/1 "2010-03-17T14:03:33Z")
4 months ago I bought a former rental car, a 2008 Chevy Cobalt, with 39,000 miles on it. 4 months and 2000 extra miles later, I have my first complaint. I find that when I come to a full stop and hold down the brake, I sometimes hear a faint then eventually louder knocking sound from under the hood. It almost sounds like a little drummer going to town on a piece of metal, but man does he keep the beat. The noise immediately stops when I release the break, and the sound only starts when I am at a full stop. Anyone? ---
**Author:** ![Docnick](https://avatars.discourse-cdn.com/v4/letter/d/ecae2f/32.png) [@Docnick](https://community.cartalk.com/u/Docnick)\ **Post date:** [March 17, 2010, 2:06pm UTC](https://community.cartalk.com/t/knocking-sounds-while-braked-from-my-08-chevy-cobalt/46210/2 "2010-03-17T14:06:03Z")
My mother-in-law’s Pontiac did the same thing and it turned out to be the antilock brake system needing adjustment. Definitely something to check out.