I have a 2005 S40 T5 AWD M66, and my rotors have recently started to feel warped...so they are due for replacing. However, I get a NASTY rhythmic clicking under braking coming from the passenger side rear brakes. I jacked the car up and took a look, and even pulled the ABS sensor to see if there was anything on the ring. Rotor looked fine, pads have plenty of life, no rocks stuck anywhere, and abs ring is clean. Could it be a CV going back? Maybe a look return spring? Help!