These are ancient (10 year old) Campag dual-pivot brakes, not sure of the brand (the markings have long since rubbed off) but think they're Mirage. Need to be totally disassembled about once a year, regular cleaning and oiling won't keep the dirt at bay forever!
The thing that thwarted me this time, was that there's a tiny set screw in one of the yokes which tightens onto the centre pivot bolt. Anyone else come across this? Up till now it's loosened OK, but this time I couldn't loosen it, the hexagonal recess for the allen key just stripped when I tried. So I just had to loosen the main pivot bolt by brute force, just enough to get some solvent, then oil, into the crack, then re-tighten again. I've probably graunched up things a bit inside.
Anyway, the brakes seem to be working nice and smooth and sweetly again, for the moment at any rate. But next time they full of crud it'll probably have to be new brakes. Unless anyone has a better idea.
The thing that thwarted me this time, was that there's a tiny set screw in one of the yokes which tightens onto the centre pivot bolt. Anyone else come across this? Up till now it's loosened OK, but this time I couldn't loosen it, the hexagonal recess for the allen key just stripped when I tried. So I just had to loosen the main pivot bolt by brute force, just enough to get some solvent, then oil, into the crack, then re-tighten again. I've probably graunched up things a bit inside.
Anyway, the brakes seem to be working nice and smooth and sweetly again, for the moment at any rate. But next time they full of crud it'll probably have to be new brakes. Unless anyone has a better idea.