I've recently acquired a TT bike from someone at work who is giving it up.
It's a Cervelo P2.
I did some fettling last night, and there was one thing that was tweeking my mechanical OCD funnybone.
The FSA rear brake calliper.
Now, I know these don't get much use on a TT bike, but it was irritating me.
The Zipp pads were rammed in to the pad carriers, but not fully. They were sticking out of the back by about 5mm, which looked shit.
Two things became apparent:
1) The pad carriers on these FSA calliper are not compatible with regular Shimano-pattern pads like the Zipp ones. The Shimano-pattern pads are slightly curved to match the rim curvature. The FSA carriers are straight, and so the pads just jammed part-way in.
2) I noticed they were assembled incorrectly: The correct order is pads - concave washer - calliper arm - flat washer - nut. So the concave washer allows for pad angle adjustment.
But they were assembled pads - calliper arm - concave washer - flat washer - nut, ie the concave washer was on the wrong side of the calliper arm and was useless.
The reason for this became apparent.
Took a new set of SwissStop Shimano-pattern carriers with new SwissStop carbon blocks and tried to fit them.
No go.
The FSA calliper does not open wide enough to accommodate standard Shimano-pattern carriers and pads between the arms and rim.
The previous owner had bodged this by shifting the concave washers to the wrong side of the arm.
Found a spare Shimano brake calliper, and indeed it opens by several mm more.
Replaced the entire calliper and fitted the new SwissStop carriers and pads and all is well.
There must be FSA-specific pads which you need for this calliper, but I want to use the Shimano-pattern carriers and pads so the FSA calliper is now in the junk box.