has anyone on here managed to redo there own bubble flares on existing brake lines. Reason I say existing is I have a spare brake line I been playing around with and i can't seem to get the flare rite, I can however on new brake lines
Yes it's possible. I have done it and I'm sure others have also. I cut a few inches off the existing line and reflared it using a flaring tool. Several years still going strong. I did wrap the threads with some teflon tape just in case.
Originally I ordered a replacement metal brake line from bmw. But it ended up taking 3-4 months to ship from Germany. So i fixed it as described above. The new metal line is still sitting in my garage just in case.
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Last edited by XnWarden; 12-04-2019 at 05:30 PM.
Thanks mate I'll keep trying
Proper tube prep, and tool use is key; perfectly square cut ends, de-burr inside/outside of tube, proper tube setback (use gauge supplied with flare set). Make sure the clamp/flare tool stays "square" on the fixture, and work slow.
Oh, don't forget to put the threaded fitting on first, and correctly oriented ...
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Last edited by Randy Forbes; 09-26-2020 at 09:16 AM.
Old thread but curious about the flaring process you performed - I'm considering this on both fuel and brakes as I convert my car to track use and want to get rid of some of the softer lines that won't be needed and can be replaced with hard line and reduce the number of connections. I recently tried to bubble flare a 3/16" brake line of stainless steel and rather than flaring, it simply collapsed the tip sideways. Have you found flaring stainless tubing requires different flaring tools than a stock steel line?
I just ran into a similar issue doing all stainless lines on a 51' Chevy. I used a Mastercool kit which really is no different than the standard bar style.I found that going slow, lubing flare tools liberally with brake fluid, and not bottoming out the tool yielded the best results although I still had a few I had to flare twice to get right. The nickle/copper line is so much nicer to flare and work with as long as it starts straight.
I ended up using a hydraulic type flare tool since I couldn't get others to work on stainless lines. Worked great and love being able to now rerun lines easily. Bending hard lines is another story - my lines sometimes look like a kids scribbling so have had a couple mis-steps in the process but in the end, very happy with the results.
With a hydraulic flare tool the bubble flares aren't that bad. I used this brand/model and I've been doing double flares and bubble flares on stainless without much of a challenge. Not the same store I used but its the same tool (although I had to buy an extra set of flares for 37 degree since it came with 45. I am using both, so it wasn't a big deal.
https://www.jbtools.com/mastercool-7...BoCnXYQAvD_BwE
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