Brake Disc Caliper problems of the 1998 Plymouth Neon

On several occassions we took vehical to the dealer and was told everything is fine just replace your brakes. After constently being sent away by the dealer, we eventually took the car to another mechanic and found out all kinds of problems: blown head gasket, replace the brakes (again), calipers drifting to one side, etc. My warranty just expired, but I think it should still be honored since the problems could have been fixed a long time ago.