2001.5 Dodge Ram Cummins Diesel 2500 4x4 Quad Cab w/4wheel disc/abs. Pedal goes to floor while normal braking, and the abs comes on. Panic braking is excellent. I've replaced a line to the back, and the left rear caliper, because it was sticking. I have bleed the system seven times, front and rear. Methods for bleeding have been vacuum, gravity, and with hose in fluid. I have replaced all the fluid with fresh. I am 100% positive that there is no air in the system. When the key is turned to run, the ABS does it's self-check, and then the light goes out.
Any help is appreciated.
It sounds like you have a bad mastercylinder cause when you panic brake it doesn't have time to bleed through the valve in the cylinder but under normal braking your foot is on pedal longer in turn giving the fluid time to bypass the valve in the mastercylinder in turn the pedal going to the floor.
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Sound like your brake booster is not working it is either electric or fluid powered. Since the diesel doesnt produce vacuum it has a power assist instead of vacuum power like found on gas trucks and cars. if the booster in a car goes bad or if being towed and applied brake several times pedal will go to floor too.
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