[David Hodgson]

I managed to get hold of Chris last night re the Jag 4 to 3 pot caliper change. Turns out it was not as successful as he first thought. The main reason for the change was that in the go-whoa event we used to hold at West Wyalong, when all cars barring the DRB's ran Jag front and rear, they all demonstrated severe front brake bias. In fact some were so bad they appeared to have no rear brake at all. Chris's RMC included.
He did some calc's on pad swept area, F & R piston surface area, m/cyl surface area and proportioning valve bias. His RMC uses the plastic top ford m/cyl.
He doesn't think he still has the artcle he wrote for Snaketales as is was over 10 years ago.
Summary of changes were;
4 pot to 3 pot fronts - smaller pad(less friction) and different force acting on pistons
Different bore size m/cyl - to change applied force
Appropriate proportioning valve within the master cyl - one that did not over restrict rear brakes, from wagon or ute - he can't remember.

He found it vastley improved the bias under hard braking such as the go-whoa produces and for street driving but may have been too much rear for circuit where you may not have a choice but to brake on a bend.