I think the challenge with the brakes is to overcome the "equal work condition" that plagues the fixed flat cam. This causes the brakes to work in phases. The first phase is very good braking caused by the high pressure of the leading shoe on the drum. As the leading shoe wears down, the trailing shoe, which has less lift, will begin to hit the drum at the same time due to the wear on the leading shoe. This causes the second phase of poorer braking.
The floating cam will prevent this by allowing the leading shoe to be forced into contact with the drum even as the trailing shoe lining remains thicker than the leading shoe. The compromise is unequal lining wear. This is arguably the reason to run different compound linings on the leading and trailing shoes of the Vincent with the hope that the lining wear will equalize and minimize the poor braking phase.
David
The floating cam will prevent this by allowing the leading shoe to be forced into contact with the drum even as the trailing shoe lining remains thicker than the leading shoe. The compromise is unequal lining wear. This is arguably the reason to run different compound linings on the leading and trailing shoes of the Vincent with the hope that the lining wear will equalize and minimize the poor braking phase.
David