46 chevy truck 468 small cam. MII front S10 rear both disc.. The brakes were installed in 05 by the original owner. It got the power master pedal assembly form RB's who is not in business anymore. I did find the receipt and the part number is 1R-949. Could not find anything on line to tell me what this is. So I don't know where I am starting from. If some one has an old catalog that would be great. There is a Wildwood adjustable valve between the mc and rear brakes. The front pads, rotors, and calipers I have just replaced. The rears I have left alone. I have vacuum bled and old school bled the fronts and rears. I cant seem to get any peddle. I have about 3 inches of travel. I don't get any brakes until the bottom and they are not good. How much travel is at the booster. Is there an inch/two? Could be I am not getting the correct travel. I am trying to understand what should be happening.