DOT 5 bad for teflon threadwrap

Forum rules
Please do not start new topics here, but here: New Panhead and Flathead topics
Post Reply
Posts: 49
Joined: Thu Oct 18, 2007 1:19 am

DOT 5 bad for teflon threadwrap


Post by ArizonaMike » Tue Jun 12, 2007 4:12 am


I heard that DOT 5 brake fluid will disintegrate Teflon thread wrap and that brakeline connections should be installed dry. Is this true? Anyone experience disintegration?

Mike in Pgh

Posts: 1392
Joined: Mon Apr 11, 2005 1:12 pm
Location: north florida
Been thanked: 4 times

Re: DOT 5 bad for teflon threadwrap


Post by fourthgear » Tue Jun 12, 2007 1:14 pm

I haven't found any thing yet that will break down Teflon tape ,not even heat ,but I'm sure there is some thing that will . I always use TT. on all threaded fittings for fluids , even flared fitting threads . Some don't and thats OK too.

Posts: 789
Joined: Tue Mar 23, 2004 6:57 am
Been thanked: 1 time

Re: DOT 5 bad for teflon threadwrap


Post by Billy » Wed Jun 13, 2007 4:49 am


Dot 5 is fully synthetic & non-hydroscopic, & as such won't even harm finished paint.. I have never had a problem w/teflon & Dot 5 (I use the paste though. (& I only use Dot 5). Dot 3 will burn paint in short order.. (but we all know that) :)

Post Reply

Return to “Brakes”