Left my 1983 Silverwing sitting all year and the return line hole at the bottom of the master cylinder was clogged. Decided to clean the whole master cylinder. Took piston out and cleaned the cylinder. Alll parts looked good, but did not measure them. Put back to gether and now I can not get it even put out any pressure. Is there a trick to this. Doesn't seem like any fluid is getting to the piston or cylinder. Do you have to prime it? If so How?