I recently brought my bike in to have the fork serviced and when they gave it back to me they had left one of my HAYES DISK BRAKE pads out. I rode it a short distance before I realized the problem and took it back for them to put the pad back in. After getting it back and riding it, the brakes went out in the first 100 feet of my first ride. I took it back again and they charged me for a new set of pistons because the seals were gone. I got it back and again, after riding it no more than 100 yards the brakes were gone once again. I took it back AGAIN and this time they say my master cylindar is shot and for $50 parts and $20 labor they put a new one in. My question is... can operating my brakes with one brake pad missing cause the damage to my master cylindar? Is this 100% their fault?