I am trying to remove the clutch master cylinder from my 1994 Explorer Sport. I removed the wheel well to gain access to the bolts and first removed the nuts from the passenger compartment. But when I tried to loosen the bolts, they seemed incredibly stuck. I wrenched on one of them hard enough to break the square, threaded retainer from its weld on the floorboard inside the vehicle. Anyone else have such a hard time with these bolts?