I have read all of the posts on brakes and have done many brake jobs, but I am having problems. I have put on new front brake hoses, new front caliphers , new pads, rear shoes and wheel cylinders, turned rotors and drums and new 1 5/16 Bendix master cylinder. I have gravity bleed, assistant bleed and vaccumed bleed the brakes and ran almost a gallon of Dot 3 through the system. I have installed a new vaccum pump and I still have a petal that goes to the floor. I had installed two 1 1/8 master cylinders before the larger Bendix unit and the petal was the same. The only part I have not replaced is the RABS unit. Can the RABS unit cause the system to act like there is air in the system. The are no ABS lights coming on and I have unplugged the rear sensor and wiring harness on the back of the RABS unit with no change in the petal , but the ABS lights do come on. The truck only has 65,000 on it. Thanks for any help.