Sounds like your M.C. piston corroded and stuck. You might be better off replacing it,than re-sleeving the old one. If the M.C. is that bad,I'd replace the hydrovac,as well. Don't forget to replace the rubber brake lines. They deteriorate from the inside,restricting flow/pressure. Steel lines rust from the inside,too. Wheel cylinders are available through N.A.P.A.,as well as other F.L.A.P.S. With the money you saved on the payment,you can buy a complete new brake system,and still be in the $1500.00 price range! Not bad!!