I had a similar problem on my RANS with the MATCO brakes. It took a lot of bleeding to get the air out. I ended up using an oil squit can filled with brake fliud. I put a bunch of rags around the master cylinder resevoir to catch the overflow, when I was bleeding them. I attached a small, snug fitting tube from the squirt can nozzle to the bleed screw on the wheel cylinder and kept pumping in fluid until there was no longer any air visibly coming out of the master cylinder. I actually had to do it a couple of times, with testing the pedal hardness, before I finally attained proper working brakes. I have now moved up to 29" AkbushWheel Airstreaks on the plane and the single pucks are not suffiecient. I am going to have to move up to dual calipers or double puck brakes.