Are the REAR rotors as hard as the fronts? I let my original rear pad wear down, started grinding over the holiday weekend, thought it was my fronts again, but I totally renewed them, doing bearings, rotors and pads last year, checked them, they are fine; so it's the rears, is replacing the REAR rotors same as the fronts? gotta pull the hub to get rotor off? Hoping they just fall away without having to pull the hub!