I agree with the above posts ..check that flex line from your frame to the rearend ...that bugger cost me a days headache when I tried to bleed my new system ..it wouldnt let fluid go past it ...an THEY WILL WORK IN REVERSE ALSO ..let the fuid pass but not go back.
Tim


1952 Chevy Shortbed

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If It Aint Broke Fix It Till It Is!