frank in wales

I have just replaced the front brake pads but find that the rubbers around the pistons are torn. Is ther a repair kit for the calipers, or will I need to consider buying new calipers or any other ideas please ? Car is Xantia 1.9 diesel M reg, and apart from the problems of breaking plastic clips on the clutch pedal it has been fantastic, comfortable, feels very safe and importantly usually about 50 M.P.G. ? Some binding on the brakes since the pads were replaced, some heat in the discs that I don,t think was there before, I am currently re-checking M.P.G. to see if it is affected by friction drag