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Stripped the hex head or the threads? If its the head try vice grips and a sharp rap with a hammer. If its the threads it would be easiest to replace the caliper.
You can also beat on the next smaller size six point socket with a hammer on the bleeder. After you let it soak with your favorite penetrating oil as mentioned.
I think a replacement rebuilt exchange caliper would be the best idea. If the bleeder has frozen so tight it probably means that it has not been bled for a lot of years. So caliper is going to be full of muck.
If you can't get that bleeder off by working it back and forth, and a new caliper is out of the question for now, try bleeding it from the banjo bolt. Your brakes won't know the difference.
Last edited by Filthy Beast; May 4, 2013 at 07:58 AM.
Reason: spelling