Just finished my install of my 3/4 ton front and rear axles. Everything is hooked up and brakes have been bled. I am using a 3/4 ton dana 44 and 14 bolt converted to disc brakes Evrything is new pads and calipers. After bleeding the brakes and getting all the air from the lines I still have spongy brakes. My thoughts is probably the combination valve has something to do with it. Or my master cylinder may be going bad. All this is in an '83 K-5 blazer with a 6.2 diesel with hydro boost. Any suggestions what I should do now? I have driven the vehicle at speeds of about 35 mph and seems to stop fairly decent but I feel needs soemthing else to make stop quicker. The bias seems to good between the front rear, but it is hard to tell right now. I really don't want to put it on the highway until I get get this problem solved. Thanks in advance.