Here goes, I have just fitted a screw type brake proportioning Bias valve to my race car, I have bled through to the Bias valve but when I come to go past this valve no fluid comes through even though the valve is wide open. When I take the top off the Valve to check for blockages and the spring is released then the fluid goes straight through and then when I put the top back on and still fully open it stops as though we have a blockage. Anybody got any ideas before I throw it and try another new one. Cheers. Mick To me it sounds as though the spring is too long or too strong. Anyone. Please it is really affecting my stress level.!!!!!!!