Nater_Potater
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- Apr 7, 2013
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When you're dealing with multi-piston calipers, there is definitely a "wrong way" for it to be installed. As Chrysler found out in the late Sixties with their equally sized four-piston calipers, the pucks have a very uneven wear, taking on a pronounced wedge-shape after only a few thousand miles. With single-piston calipers, the puck is held at a pretty constant angle in relation to the rotor's face, but, once you introduce two (or three) pistons to the puck, the puck can now rotate (as seen as if looking down on the caliper) in its mount as the friction face wears. This is due to the fact that the leading edge of the puck sees both inward pressure in line with the puck, plus a force ninety degrees to that, imparted by the sweeping face of the rotor which tends to cause the leading edge of the puck to "nose-dive" into the rotor. To counteract this effect, modern multi-piston calipers have the leading edge piston noticeably smaller than the subsequent pistons, attempting to counter the rotational forces. Take a look at any of the current sport bike calipers out there.Fast Eddie said:
If the caliper is turned around in relation to the disc's forward rotation, the uneven wear problem would be greatly amplified by the different piston sizes now being backwards. If they're going to offer us a six-piston caliper, they'll need to supply both MkII and MkIII with the pistons arranged accordingly.
Nathan
