Anywhere from 0-35mph I hear a grinding noise. Its not constant it only happens for a portion of one cycle of the wheel. The noise is more noticeable when the brakes are not applied, when they are it just quiets down a little. Not feeling any vibration in the brake pedal, just in my seat. Anything above 35-80mph I can't hear it anymore. I bought the car with drilled and slotted rotors but I cannot see any cracks in them and they feel very smooth to the touch. I briefly looked at the dust shields as well, they look like shit and appear to be rusting out very quickly but they don't seem to be in contact with anything that is spinning.

Does anyone have any ideas? The car is a 97 vr4 with exhaust, intake, tien s springs and 145k on the clock.

Thanks in advance, John