Designed a balance bar brake bias system for my gravity racer. Finally got it all hooked up and this happens:
I can only think that the cylinder pushrods are allowing too much non linear motion (im using cheap quad bike cylinders) but looking at the design of Wilwood/Girling type cylinders they look very much the same - pushrod with domed end sitting against the piston and held in place with a washer and circlip.
Looking at it, what the balance bar is doing seems perfectly reasonable - moving up and down at the ends rather than pushing against the spring. But what makes my system so different and how do other systems stay so linear?