had a guy last week running Avid Elixirs on his Cannondale thingamajig.
the brakes locked up totally tot he point you couldn't turn or even remove the wheel without alomst excessive brute force.
we tried pushing the pistons back in…. pushing them out… cleaning them… but all to no avail.
the poor sod had to walk 500m down a mountain and then get a taxi to town. he ended up missing out on a superb (no really… absolutely superb) bit of trail because of his Avid brakes.
turns out that it's a common problem (says the main connodale dealer in Germany) and occurs when the temperature changes too rapidly. we were at 2300m and had decended about 600m before his brakes locked up.
problem was 'solved' the next day by opening the valve and letting out a little oil.
i wouldn't buy them.