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[quote="RFlower"]Are you guys aware of possible problems of failure of Teflon hoses due to flexing and/or low temperature?

The following extract is from [url]http://www.dimebank.com/BrakePlumbing.html[/url]

[i]A few words about Teflon lines: they may not have a place on your street car. For starters, the Teflon lines you make up at home don't have DOT approval, because they haven't been through the DOT approval process and you're not a certified manufacturer. Even the Teflon lines you can buy pre-built are probably not DOT approved (though there are a few coming onto the market) for the same certification reasons. The main reason for this lack of approval is that manufacturers of racing gear don't care to spend the money - they're building the hoses for racers. The next reason is that the DOT expected lifetime for such brake hoses is five years, and the prudent racer will replace his or her brake hoses every other season, just to be sure. (This is a good reason to make your own - then you can reuse the fittings and just buy new olives and hose.) There are some concerns about using Teflon line in cold environments, though Aircraft Spruce is willing to sell you lines custom made from Aeroquip Teflon hose and rate them to -40 degF, so I'm not so sure that's a concern. It may well be that the intended application for those lines is not subject to as much repeated deflection as the flex line snaking through your front suspension out to the caliper. [/i]

The fact that the lines are not approved could be an issue in the event of an accident due to brake failure.

I know I am having second thoughts about them, as the braiding means that the hose itself cannot be inspected.[/quote]

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