If I let off the brakes very slowly there's the usual groaning but it is now also accompanied by a loud resonating sound (kinda like blowing over the top of an empty 2 liter bottle) that starts when the car first starts to move - loud enough to where you feel it as well as hear it. I just had 4 new tires put on and noticed it immediately after I left the tire place. It happens intermittently: sometimes when the car is cold, but today I noticed it after we had been driving 2+ hrs straight. Car has 87k miles on it, front pads are OEM and were put on less than a year ago, rotors are probably original. I first suspected warped rotors but there is not much pulsation to the brakes, at least not any that wasn't there before the noise started. I also retorqued all the lugs in the front (appears to be coming from front right side but not conclusive). Please let me know if you have heard this type of sound before and/or have some ideas on what it could be.

 

Maybe the caliper is sticking. Im having a problem with the rear caliper, it sticks and I get a groaning type noise from it sometimes.

 

so would i just remove the wheels and grease the caliper pins? also is it possible to measure runout on rotors without removing them to see if they need ot be turned? sorry for the newb questions, this is the first car I've owned or worked on

 

I had the same prob and it was cv joints/drive shaft. Check it out.

 

I have that problem (or at least one like it). When I am parked on an incline and I disengage the e brake I hear this loud kinda like grinding but only until I put it in first. My homie said my rotors were glazed. I am gonna get slotted ones soon so I just deal with it for right now.

 

same problem with my car and i'm almost damn positive that its a caliper sticking. One of my rear caliper pistons wouldn't screw back in while changing my brakes, so i have a feeling the groaning noise is the piston trying to work its way back into the caliper. i just picked up a new caliper today, so i'll see if it stops that annoying noise.

 

i got the same noise as sharkulator. I need rear rotors