Originally Posted by
smiley
Thanks Mark will sort rears also and bias valve, just a question you say it doesn't matter much why are thier 4 6 8 pots? More pistons more clamping force no?
The clamping force is not about the number of pistons. It is about the total surface area of the pistons. And 6 pot calipers have smaller pistons than 4 pots. The AP 6 pots actually have exactly the same surface area as the AP 4 pots. But the 6 pots do give a better distributed clamping force, which is needed for big discs as the caliper becomes quite long.
But you should really keep the surface area of the pistons close to what they are now. It is matched to the master cylinder and using a different surface area will change the pedal travel and the pedal feel. The same goes for the rear. In my opinion you shouldn’t put the AP 4 pots, as are sold as a bolt on kit, on the rear as the pistons are too big and overbrakes the rear.