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I just used copper brake pipe. Technically incorrect but there is enough 'give' in the copper. Never had any problems and they're still on PKN afaik...
Early converted cars are often like this, because that's how Jon did it on his first one! At that time, there simply wasn't access to bespoke flexis we have today.
He's admitted it's not a perfect solution and I agree for 2 reasons, firstly, the caliper is always moving against the fixed pipe retaining bracket in service, only a mm or two in the main, but still moving every time the brakes are applied and released, with an underlying trend outwards as the pads wear. This is a prime candidate for work hardening and failure of the pipe.
Secondly is the necessity to remove the pipe and therefore have to re-bleed at least when taking the caliper off for changing pads or bend it out of the way (which is worse)
With a flexi in place, neither of these potential problems exist. I can't speak for anyone else, but I don't take ANY chances with brakes. OTT? Maybe! But i'd rather be safe than sorry! The way I drive, my first prang will likely be my last!
Steve