Brake thread dope
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Post Fiend
Joined: May 2006
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From: Central Florida
Brake thread dope
I flushed my brake fluid, it was green and after much research, fomoco had an odd batch of brake fluid that absorbed water and corroded some copper somewhere. I used my old mity vac to suck the fluid out, I went through 6 cans (pints) and took out a half a gallon of nasty green fluid. Anyhow, the dope on the bleeder screws had warn away, and I sucked a pile of air through the threads. To finish the job, I had tef-tape them all, but I am not sure about tef tape and brake systems. Is there a better choice for pipe dope to use on these threads?
More Turbo
Joined: Aug 2006
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From: W. Wisc
The threads aren't typically the sealing type in bleed fittings - they are straight threaded, not tapered pipe threads. The sealing is a shut-off surface down in the fitting. If you need teflon tape or anything on bleed fitting threads, you have another problem in there. They should seal on their own.
-Dave
-Dave
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Post Fiend
Joined: May 2006
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From: Central Florida
They seal fine when closed, but I was sucking alot of air while vacuum bleeding. The threads are loose enough that air was getting around them and into my vacuum tube where I expected only fluid or air that was in the system. Not the volume I was extracting until I figured it out.
More Turbo
Joined: Aug 2006
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From: W. Wisc
Ah. Gotcha. Well sure then, Teflon tape would work fine as long as you hold it back from the end as the other poster noted. I'd also then remove it before putting the vehicle back in service. It PROBABLY wouldn't hurt anything to stay in there, as long as none of it got into the fluid path. You don't want a piece breaking off and messing up the brakes or ABS.
Chemically, Teflon would be pretty impervious to brake fluid. It might swell it slightly, but shouldn't degrade or dissolve it.
-Dave
Chemically, Teflon would be pretty impervious to brake fluid. It might swell it slightly, but shouldn't degrade or dissolve it.
-Dave
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Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
Good to know about it's stability, brake fluid is some pretty nasty stuff. I am a little more concerned about how the teflon, brake fluid and heat will react.
I left it on, but I am pretty good with teftape, I had to use it on old Steel 72 scuba cylinders. I got pretty decent about just enough to insulate and no more. Thanks for the thought though.
I left it on, but I am pretty good with teftape, I had to use it on old Steel 72 scuba cylinders. I got pretty decent about just enough to insulate and no more. Thanks for the thought though.
