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The lines are stainless, the hoses are standard issue Autozone. But if hoses were the issue would they not fail when the vehicle was moving forward. Backin out of the driveway or backing straight never seems to be an issue. I have taken it out in a parking lot and tried to get them to fail. They will lock up and skid under hard braking in forward or reverse. She has not been topped up since I bled the brakes 3 months ago and I have not lost any fluid. It is a pleasure vehicle and I always check the floor and tires for leaks that may show up but there is never anything but a drop or two from the oil pan plug. I would not know anything about fluid bypassing the master??? or brake pedal flexing either. Remember this is a 54. The master is under the cab below the drivers seat and the pedal is not a swing type but an uncomfortable downward arc to the master below the cab. It is a pretty solid piece of iron as they built them in 54. I cannot imagine it flexing they way it is built and mounted.
The pushrod is adjustable, maybe I need to give it a little more length. i will try that tomorrow. I am sorry I ever started with Dot 5 do I need to replace any components or can i just flush it through with 3 or 4?