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[Omegatoy]

Got the wheel off, but can't undo the caliper, so I've splashed the WD40 around (carefully, obviously) and will leave it to soak.

Turning the hub, there is a definite contact being made by something part of the way round. It was resonating on the backing plate (although that could have been secondary from somewhere else), so I've played with the backing plate and it doesn't seem to be happening any more.

That doesn't really sound like a proper solution (and I'm planning a 250 mile round trip at the weekend), so I'll continue trying to strip it down but if I can't manage that I'll do the necessary 20 miles to see if it starts happening again.

caliper bolts are extremely tight!! you need a good heave on them to undo, sounds to me lke hanbrake shoes are touching or the rear pistons on the disc are sticking

[Dubious]

Well, I never managed to get those caliper bolts off, but seem to have cured the problem my manipulating the backing plate and blowing air in to clear the dust. The disks (apart from the friction surfaces) have loads of loose rust on the surface so I imagine there's a constant stream of new rust/dust getting in somewhere and causing a problem. The brakes themselves (foot and hand) all seem fine, so I'm reasonably happy although I'll obviously keep and eye on things for a good while.

Thanks for all the help.