MBM Disc Conversion Kit?

[Chewievette]

I wont get into all the little details but I purchased MBM's front disc conversion kit (1968 c-10 factory power brakes) this past spring along with a stainless lines kit from LMC. Installation started in June and was completed within two weekends. I had a problem initially with not being able to get a firm pedal which was eventually tracked down to a bad proportioning valve. During the post install bleeding of the new prop the pedal to booster rod bent forcing a further delay and numerous problems getting parts (not from MBM) for a new rod. That was finally solved and I installed the new rod this week and re-bled the entire system. I finally have brakes again! During normal around town driving the brakes feel fine and normal but when sitting at a light I can push the pedal all the way to the floor, I've never been able to do that in another vehicle. Also during a panic stop it takes a considerable amount of force to lock up the wheels, much more than I would expect, the pedal needs to be firmly to the floor to lock up. I have bled the system several times now and cannot find any additional air. While the brakes are functional they just dont feel right. Any suggestions why I'm not getting a good pedal feel are most welcome. I have tried everything I can think of and I've read MBM's instructions and troubleshooting manuals cover to cover several times.