# Brakes? Wheel bearing? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** v70, transmissions, volvo, brakes, wheels\ **Created:** [March 22, 2010, 10:46pm UTC](https://community.cartalk.com/t/brakes-wheel-bearing/46499 "2010-03-22T22:46:45Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![caraddict](https://avatars.discourse-cdn.com/v4/letter/c/e0b2c6/32.png) [@caraddict](https://community.cartalk.com/u/caraddict)\ **Post date:** [March 22, 2010, 10:46pm UTC](https://community.cartalk.com/t/brakes-wheel-bearing/46499/1 "2010-03-22T22:46:45Z")
Ok, here’s my issue. My car (a 2004 V70 wagon that looks like a hearse) has recently begun making a cross between a hum and a moo when taking off from a stop. It doesn’t happen every time, it doesn’t matter if the car is warm or cold. It seems to only happen when I’m accelerating slowly to moderately and once I get to 10 mph, it goes away. I did rotors and pads all the way around about 10000 miles ago. The pads look good - as far as I can tell. The car has 78000 miles on it. I usually don’t hang onto cars this long, but I really like this thing. Thanks for your help! ---
**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\ **Post date:** [March 22, 2010, 11:19pm UTC](https://community.cartalk.com/t/brakes-wheel-bearing/46499/2 "2010-03-22T23:19:27Z")
Brakes and wheel bearings don’t hum or moo. It’s something else. My guess would be a loose heat shield somewhere in the exhaust system. Simple to fix, usually, if you can figure out where it’s coming from. Please note the word, “guess.” I can’t see the car and I can’t hear the noise. ---
**Author:** ![caraddict](https://avatars.discourse-cdn.com/v4/letter/c/e0b2c6/32.png) [@caraddict](https://community.cartalk.com/u/caraddict)\ **Post date:** [March 23, 2010, 4:12pm UTC](https://community.cartalk.com/t/brakes-wheel-bearing/46499/3 "2010-03-23T16:12:15Z")
I have some experience with mooing caused by heat shields (Taurus wagon, F250) and I don’t think that’s it. The sound is kind of like when a garbage truck or bus stop and they make that heavier high-pitched squeak/moan/moo sound. I will try and throw it up on the hoist at work this week and look for anything heat shield or guard related. ---
**Author:** ![ignoramus9](https://avatars.discourse-cdn.com/v4/letter/i/d07c76/32.png) [@ignoramus9](https://community.cartalk.com/u/ignoramus9)\ **Post date:** [March 23, 2010, 4:24pm UTC](https://community.cartalk.com/t/brakes-wheel-bearing/46499/4 "2010-03-23T16:24:42Z")
This sounds like a loose or broken baffel in the muffler to me. It does not sound like a wheel bearing or rotor problem.