Glad to see i am not the only one that has lost sleep on this one. I have found only one thing that works. If you attach the brake lines to the master cylinder and then remove the cylinder from the frame and bend the line so the unit is horizontal NOT Vertical. grab a screw driver and pump the little air bubble out. It won't bleed properly in the vertical position. If the reservoir is loosing fluid but you have no visual leaks it might be leaking inside the trucks trans axle. lets us know if any of our suggestions work
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