Originally Posted by
canopus
This isn't a problem with the pads either, the only way these will open like that is if the barrel isn't closing more than 190 deg to the cable pull so that the pull action keeps the QR closed.
The pivot bolt adjustment on yours is loose also. Tightening it up a little more would take care of the squeal.
The pivot bolts (I assume you mean pivot
nuts) are tight, to the point that the calipers arms were binding ever so slightly before I put spring tension on them during their rebuild.
That said, I didn't have time today to look at the cam (only time to photograph it) - and since the Pro isn't in the house, I don't have it at hand - but I was looking over post-rebuild photos of the caliper:
I know quite well that cam is as far in as the Q/R will let it (keep in mind that I repeated this test 5 times, ensuring the Q/R had been bottomed out), but it looks quite close to 180 degrees, if not directly on it. Close enough to flip open, at any rate.
I'll have to look at it closer. Mind you, I did swap the cam from another post-CPSC caliper; Campagnolo might have modified the design in some obscure fashion between the two.
-Kurt