I recently took the brake booster off. I put a master cylinder straight to firewall and hooked up rod and lines. Sitting on stands we bled brakes and have a good pedal and they stop. When you set it down they don't stop unless you stand on pedal. This is not going to work. Is there a difference in master cylinders for power and manual brakes? I'm pretty sure the one I got was for manual brakes. It was for a 77 GMC truck and it came with the brake rod. Any help on this?