DollyDodge Posted March 30, 2010 Report Posted March 30, 2010 I replaced the Master Cylinder on the B-2-C, and put all new fittings on. I bench bled the MC, put it back on and attached the brake line. The fitting drips ever so slightly. I took the line off again, cleaned the end again (light wire brush on the dremel), the line end looks fine. Attached the line again, and I still have a realy slow leak. Anybody got any ideas on how to get the danged thing to stop leaking. Quote
greg g Posted March 30, 2010 Report Posted March 30, 2010 Check the condition of the flair on the brake line. You might need to replace it if there is damage. Quote
JBNeal Posted March 30, 2010 Report Posted March 30, 2010 (edited) How'bout some teflon tape on the tube nut threads, that might help. I fudged a li'l bit & put some teflon on the end of the tube just shy of the flare, then teflon on the nut. If your flares have any distortion or tears, they won't seat on the brass mating surface cleanly. Brass is supposed to form to steel taper threads, but I've found that a li'l teflon fills in any gaps that might form. Edited March 30, 2010 by JBNeal keyboard malfunction Quote
DollyDodge Posted March 30, 2010 Author Report Posted March 30, 2010 the flare looks really clean, no distortion, or any blemishes I can see. I had tried a "pipe dope" that is designed for high pressure and for caustic fluids, but that didn't work either, though I did that before I replaced the fitting on the MC. I will try the teflon. Quote
MBF Posted March 30, 2010 Report Posted March 30, 2010 How does the double flare look on the end of the brake line? Was the fitting or MC ever cross threaded? Are you sure that the block that screws into the MC isn't the culprit? Just something else to consider. Mike Quote
DollyDodge Posted March 30, 2010 Author Report Posted March 30, 2010 I am fairly certain the leak is coming out of the joint between the brake line and the brass fitting. I have checked where the block goes into the MC and it is dry. The flare looks good to me. The old fitting lthat goes into the MC looked like it had been over tightened at some point, that is why I got a new one. This leak is very persistant. Quote
Don Coatney Posted March 30, 2010 Report Posted March 30, 2010 Suggest you replace the leaking line with a new piece of tubing. Make new double flares on the new line. The use of teflon tape or any kind of pipe dope is not required on a flare fitting. The seal is made by the flare not the threaded portion of the fitting. Quote
Fernando Mendes Posted March 30, 2010 Report Posted March 30, 2010 49Dodge1ton,can you show me this product teflon tape?I don't know it still. Quote
greg g Posted March 30, 2010 Report Posted March 30, 2010 Its available in plumbing sections of hardware stores. ot sure I would trust it in contact with brake fluid. Quote
Fernando Mendes Posted April 1, 2010 Report Posted April 1, 2010 Is it the same as water plumbing tape(white)? Quote
Dave72dt Posted April 1, 2010 Report Posted April 1, 2010 Probably the same stuff. Usually about a 1/4 to 3/8 inch wide, stretches, used to wrap around the threads on pipes, fittings to obtain a good seal. Replaces plumbers pipe dope that was brushed on the threads. Quote
DollyDodge Posted April 4, 2010 Author Report Posted April 4, 2010 I took the line and Mc off again, cleaned the fittings and flair, put it back toghether and no leak yet. Yippie Quote
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