I have put in a new MC Rebuild kit into my 1981 Deluxe.Also had to buy a new fluid cup. According to schematic of my handbook everything has been put together in the right order. After I hooked up the brake line and filled the cup with brake fluid, I started pumping.......no pressure!! I disconnected the brake line from MC and pumped again and there is nothing coming out!!! Is there a trick to airbleeding a "dry" brake line? Does the system need some brake fluid in the line in order to have the MC be able to pump(priming)? I have taking the piston and spring out several times and do not come up with a solution. Has this ever happened to anybody?