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I have a 92 E350 Ford chassis Class C with the same problem John Newman describes. Just had the master cylinder replaced, and bled with a power bleeder that pushes all fluid out from the M. cylinder. The said no air was in the system. Took it right back in, as the pedal still went to the floor, and they did it again. The pedal still goes all the way down, and with the engine off it goes almost to the floor. But it works fine in actual driving (over 100,000 miles), and in panic stops, and it has never had a "spongy" feel in use, but I can't understand why this occurs. Hope someone has an answer that tests out. |