hi,got my rear brakes changed today,great but notice the nsr caliper was wet with brake fluid,the bolt thats goes in was not tight,so i tighten it up,took the car to get the brakes fluid done,they said my capiler is needing changed,could it be that the seal is no good on the capiler where the bolt goes in or will i need a new capiler,help again plz,got the tool for the rear brakes if any1 needs it