no brake pressure

i just replaced the front calipers and rear wheel cyls and i only get pressure when i pump them up.....must have bled the front and rears 20 times ...mind you it has no abs....just a regular brakein system...im gonna put a new master cyl on it....does that sound about right?

Did you ever run the M/C dry when you were bleeding it?

nope...kept it topd off every few shots

Personally, it's never happened to me. You'll find it noted around here to be careful when bleeding brakes to not stroke the M/C too far. Something about a ridge inside the bore that can develop into a leak, which would mean a new M/C.