I found this post by searching brake line bleeding - glad I found it.
I just installed a set of Gaffer SS brake lines on the front end of my 2007 DL650. The kit I have is the one using two separate lines, with a double banjo bolt at the master cylinder. Everything went together fine, in the order it is suppose to.
I removed the master cyl cap to make it easier to add fluid, as I fed and bled two new (empty) lines. I started by opening the bleeder on the right-hand wheel cylinder. When I started pumping the brake lever, there was an initial push of fluid coming out of the clear drain line I attached. Then, it stopped and the system never built any pressure and the fluid level did not drop.
I closed the bleeder screw and moved to the left-hand wheel cylinder. I hooked up my clear drain line and opened the bleeder screw. Same thing happened - an initial push of fluid, and then nothing more. I closed that bleeder screw (both closed now) and pumped the brake lever (a lot) to see if any pressure would build. It doesn't.
I see that there's a bleeder screw on the front master cylinder. I haven't done anything with that yet, thinking instead I'd post this rather than make a mistake. What is the purpose of that bleed screw? Do I need to open that to help fill the empty lines? I think the fluid that came out of the wheel cylinders was old fluid already in them, and that air created by pumping the brake lever, pushed that small amount of fluid... not new fluid in the new lines.
BTW, I have installed and bled a lot of brakes on cars, bikes, go-karts, etc. This is the first time I have experienced "nothing" happening when pumping the master cylinder.
Thanks for any help you can provide.
Scott ...(a.k.a. Scoots)
2007 Suzuki V-Strom DL650
The fine brands that help make it my own...