Disconnect the brake line where it attaches to the hard line on the body. PLEASE use a 10mm Flare nut wrench on this or you will be very sorry later. These connections are always very tight and if you round off the edges of the nut you will regret it. A wrench is about $6 at any Autozone or Checker and well worth the money. Plug the hard line with a plastic cap or tube section to prevent the brake fluid from slowly draining out of the master cyclinder.