Rear brake pipe replacement

I'm not sure I believe that, either. The roll of copper-nickel tubing I've got here has a definite coppery color. And ... I don't think anybody bothers putting a green polymer coating over it, 'cause it hardly corrodes.

 

He did say it's not the copper nickel that I'm going to see when I go looking online at the break places some kind of cheap stuff whatever it's green coated and that's what he called it but whatever it is I don't think it's stainless but if it is well that's cool I'm usually not fooling with it too tough and I would expect it not to corrode too easily.

 

Well, sure, but different materials show huge important differences on that dimension, when the time is "rough lifetime of car" and the chemicals in surrounding are "typical roadway environment". (The Swedish roadway environment was where the CuNiFe tubing earned its laurels.)

 

Yeah that's true everything on the planet and on this Earth eventually will fade away. So if the Toyota brake lines were stainless steel the ones on my '93 Corolla in southern United States certainly shouldn't have been rotted through by 2003 or four or even five now maybe in Western Massachusetts on the snow roads and possibly. So that's one way I can pretty much see that my Corollas didn't have stainless brake lines and just because of Prius has an aluminum hood I don't expect a whole lot of chassis parts running down under the car to be made out of really great materials they're going to be made like all their other cars pretty much NASA didn't design stainless steel brake lines just for the Prius I don't think just being funny.

 

About 10 or 15 years ago, I did an extended test on 3 brake line materials (I had to be convinced that the aftermarket Cu-Ni tubing was any good). I took a 6" length of "standard" plated steel, green poly coated steel, and Cu-Ni. Sealed the ends and put them in a jar filled with a saturated water- road salt solution. Gently agitated the jar once a week or so. Pulled the samples out after 6 months.

The steel line looked as bad as you would expect- lots of surface rust everywhere, beginnings of scaling. The poly coat looked much better, but had some white "blooms" here and there (I guess there are minor imperfections in the plastic). The Cu-Ni just looked very dull brown.

I pretty much only use Cu-Ni since then. I sometimes see a slight greenish patina on some of the older repairs, but have never had any failures.

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Luckily usually by the time I even start thinking about brake lines the car is pretty much on the way out going to be a parts car or whatever and where I am my God it would probably take 40 years for my brake lines to deteriorate here in North Carolina even when I'm at the junkyard looking at these cars in various other cars brake lines are usually in real fine shape even exhaust down here nothing. Now when I was in the New England states a year and a half and all that stuff is almost junk unless you have a garage and you religiously hose off that car almost on the daily which one I live there I had no garage and I didn't own a home didn't even have a hose

 

Stainless tubing is VERY hard and very difficult to flare. That said, I have NEVER seen stainless tubing that had the green polycoat as well.

Fuel lines on flexfuel cars are often stainless because of corrosion problems. I can't recall ever seeing a car with stainless brake lines. (that would be more $$ than polycoated steel).

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