Brake nut/head set problem

I've got a Campag record threaded headset, and I'm trying to fit an old (mid-90s?) Veloce front brake.

The problem I'm having is that it appears that the hex-nut on the back of the front brake appears to be too big to fit 'under' the headset. By this, I don't mean the mounting bolt that you fit in the back of the forks, but the nut that sits flush with the calipers themselves.

When I try fitting it, I can't come close to tightening the mounting bolt that goes through the fork, as the hex-nut pushes up against the cup of the headset, so that it's nigh-impossible to turn the steerer.

Has anyone had this problem before? Can I just file down one side of the hex-nut? Will purchasing a different front brake solve the problem?

You need to add a spacer between the fork crown and front brake (and be sure to get one that conforms to the fork, i.e.: a washer with a curved rear surface for a curved fork crown). Look between the front fork and the back of the brake in this photo for an example:

-Kurt

Ah right - I've been placing a washer there, but it must be too thin to make a difference.

Cheers.

Ah right - I've been placing a washer there, but it must be too thin to make a difference.

Just ensure that washer has the proper curve to conform to your frame on one side, and is flat on the other. A curved washer from the hardware store won't cut it.

-Kurt