if the front brake makes a kind of "crunchy"/grinding sound when you apply the brake does that mean the rotor is too warped ?
Is there any way to repair a slightly warped rotor? Seems this rotor has always been very slightly dinged, but the grinding has come on recently. Worse case, how much does a new RC51 rotor cost? The bike has 35,000K.
I don't think the pads are too worn, so lets assume its something to do with the rotor?