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Old 09-30-2020, 09:13 PM   #1
PeteVS
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Default "Poly" brake lines...

I've done a few brake lines (flared and bent) in steel. Next project I wound up using copper nickel which I much prefer. I don't even want to think about working with stainless. But our local parts house has "poly" lines. They're kind of an ugly dark green color but the guys who work there don't seem to know much about them. Can anyone explain them to me? Thanks!!
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Old 09-30-2020, 10:03 PM   #2
Jay in Mass
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Default Re: "Poly" brake lines...

I never heard of the poly brake lines. Hope that someone will chime in and let us know
about them.
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Old 09-30-2020, 11:50 PM   #3
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Default Re: "Poly" brake lines...

I've used them, and I didn't think they were any different except maybe the finish on them.
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Old 10-01-2020, 04:58 AM   #4
51 MERC-CT
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Default Re: "Poly" brake lines...

The "Poly" part is just a plastic coating that is applied to help prevent corrosion due to road salt etc.
Otherwise the tube has the same form-ability characteristics as copper-nickel tube.
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Old 10-01-2020, 06:24 AM   #5
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Default Re: "Poly" brake lines...

i dont understand plastic coating on copper nickel. i thought copper nickel didnt get corrosion. Paul
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Old 10-01-2020, 06:39 AM   #6
Kurt in NJ
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Default Re: "Poly" brake lines...

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Around here those poly covered lines rust out in under 10 years-- before the poly lines were used it was rare to have a rusted out brake pipe, perhaps 20 feet of pipe a year, now the shop uses over 100 feet of pipe a week--- use the copper nickel
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Old 10-01-2020, 06:42 AM   #7
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Default Re: "Poly" brake lines...

Next time I go to get something, I'll take a magnet to see it it's just coated steel and I'll report back.
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Old 10-01-2020, 07:07 AM   #8
51 MERC-CT
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Default Re: "Poly" brake lines...

Quote:
Originally Posted by oldbugger View Post
i dont understand plastic coating on copper nickel. i thought copper nickel didnt get corrosion. Paul
Where did you get the idea that copper-nickel brake line is poly-coated??
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Old 10-01-2020, 08:33 AM   #9
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Default Re: "Poly" brake lines...

Goggle it

Underneath the PVF-coating is a double-wall, low carbon steel, copper brazed tubing which meets all international and U.S. requirements for brake tubing. The difference being that Poly-Armour offers 30 times the corrosion resistance of galvanized steel alone.
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Old 10-01-2020, 09:42 AM   #10
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Default Re: "Poly" brake lines...

It's standard steel brake pipe with a thin green plastic skin on it. I think it may have been (or might still be) OEM fitment for some manufacturers.

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Old 10-01-2020, 09:50 AM   #11
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Default Re: "Poly" brake lines...

Quote:
Originally Posted by Mart View Post
It's standard steel brake pipe with a thin green plastic skin on it. I think it may have been (or might still be) OEM fitment for some manufacturers.

Mart.
I know Ford uses it, on some models at least.
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Old 10-01-2020, 05:04 PM   #12
cadillac512
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Default Re: "Poly" brake lines...

Quote:
Originally Posted by Mart View Post
It's standard steel brake pipe with a thin green plastic skin on it. I think it may have been (or might still be) OEM fitment for some manufacturers.

Mart.

This is correct.
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Old 10-02-2020, 07:05 AM   #13
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Default Re: "Poly" brake lines...

i used a piece to repair a fuel rail on my truck. I used silicone bronze with a TIG to connect it so I'm guessing they are steel. Finish sanded off but seemd to be on there good.
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Old 10-02-2020, 07:16 AM   #14
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Default Re: "Poly" brake lines...

I replaced my rear lines on a daily driver after they rusted out. After about 5 or 6 years they looked like pretzel sticks.
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