AJp80 Posted August 16, 2017 Report Share Posted August 16, 2017 I'm gearing up for a manual swap this weekend. In the process of making my list and checking it twice, I've noticed that I'm missing the hose that connects the brake fluid reservoir to the master cylinder. I can't find that part anywhere, and all the part numbers I have for it are discontinued. Has anyone else ran into this problem? Link to comment Share on other sites More sharing options...
andyb5 Posted August 16, 2017 Report Share Posted August 16, 2017 Alex, Matt and I have used a piece of generic fuel/coolant rated hose from Autozone. The "hardest" thing related to that hose is cutting open the nipple on the reservoir without dumping a ton of brake fluid everywhere. Link to comment Share on other sites More sharing options...
gdog Posted August 17, 2017 Report Share Posted August 17, 2017 I'd be wary unless it's actually rated for alcohol based brake fluid. Generally fuel line is not, but I could be wrong..? When I worked in a shop professionally (back when dinosaurs roamed..) we used the blue braided bmw hose; super expensive! I'm sure there are cheaper options now. Link to comment Share on other sites More sharing options...
AJp80 Posted August 17, 2017 Author Report Share Posted August 17, 2017 Thanks Andy. I've found that most hoses for these applications are made of EPDM rubber. Some heater hoses appear to be made out of that material, so I think you're right. Judging from the barb on the MC, it appears to be an 8mm or 5/16th" hose. Link to comment Share on other sites More sharing options...
Brad850 Posted August 17, 2017 Report Share Posted August 17, 2017 21 hours ago, gdog said: I'd be wary unless it's actually rated for alcohol based brake fluid. Generally fuel line is not, but I could be wrong..? When I worked in a shop professionally (back when dinosaurs roamed..) we used the blue braided bmw hose; super expensive! I'm sure there are cheaper options now. I've had this for a few years with no issues at all. Luckily the line isn't under any pressure so as long as the rubber doesn't break down you'll be fine. Link to comment Share on other sites More sharing options...
AJp80 Posted August 22, 2017 Author Report Share Posted August 22, 2017 In case this is helpful for other, I found this reference for rubber resistance to chemicals due to their swell. EPDM has excellent resistance to polyethylene glycol (DOT4), and HNBR (fuel injector line) has good resistance.https://www.marcorubber.com/o-ring-chemical-compatibility-chart-11.htm Link to comment Share on other sites More sharing options...
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