in august i purchased drilled and slotted rotors for my 98 s70..
when i installed them i added brand new oem braked pads from volvo..
starting in like november to now.. ive been hearing noises every time i brake, it sounds like if there was water in the brakes.. i spoke to a friend of mine nd he said it might be the calliper or that the rotors are warped... is it possible for them to be warped already?

 

If the rotors are warped, you would feel the shimmy when braking. The only way to be sure is remove the wheels and inspect for the reason of the noise.

 

The noise is kind of normal. The drilled and slotted ones make noise all the time while breaking.

It is like a muffled noise like when you take a baseball card and put it on a bike to make the motor noise.

 

If you didn't properly bed the new brakes in, then yes.....they can warp.

 

I have drilled rotors on my car all the way around and it makes noise all the time it is from them being drilled and slotted.