Flexible Brake Lines a no-no???

Are they just really long rubber lines? That would be a no-no.

Steel braided to resist expansion.... still a no-no, but getting better.



I think you want hard lines untill they change to flex. I've had a flex line burst on several cars due to rubbing against the body, even with the stock flex line and location. The more flex line you have the more there is a chance for soemthing to go wrong

you could use flexible brake line through the entire system if you like, HOWEVER, you run the big risk that the line will have a hole worn in it, and losing your brakes. and yes you could put a hard shield around it, but then you have another problem you havent considered. that is the flexible line, even braided steel line flexes under pressure, and the longer the run, the more the flexing which is why you want to limit the flexible line runs as much as possible.

Flexible brake line do expand to a certain degree, deflecting some of the brake pressure from being applied effectively. The shorter de flex line, the better.
Use teflon/braided lines for the flex, and plumb everything else with hard lines. That's what the racers do, street rod builders and so on. There's a reason why this is the preferred method.