I'm renewing the rear brake pipes (only a small section) on my Peugeot 205. After copious sprays of Plusgas yesterday and this morning, I managed to loosen the union to the flexible pipe and the nut on the backplate for the near-side, but the off-side is a problem. I've loosened the union to the flexible pipe, but the nut on the backplate has been rounded off by someone before me. There's no chance of getting any grip on it at all, even with a proper 11mm brake spanner. I was thinking of filing all five sides down, until the 10mm brake spanner fits, but I can't even find a flat side to start on. The bleed nipple on the off-side snapped off, despite plenty of Plusgas yesterday. Any suggestions ? Should I just fit the near side pipe and get a garage to do the off side ? Maybe I should see if I can undo the wheel cylinder nuts, then pull the wheel cylinder and brake pipe through the backplate hole. I could then go to a local garage, maybe, and ask if they can undo it (or maybe my local motor factor could do it, as I'd be buying the new pipes from them.