Hey guys, I'm having an issue bleeding the rear brake on my bike. Its got a full throttle inc master cylinder that came on it. Unsure of age. I put a new stainless steel line on it and for some damn reason they just won't bleed. Its not getting any fluid into the master cylinder at all. I know this sounds like I'm a noob, but I know what I'm doing lol. Could my master cylinder be bad? I dunno wtf is going on but I gotta have brakes!

 

Did you use new crush-rings?

They're made of copper and after tightening down once,
they're case-hardened. So they don't seat properly if re-used.
It's possible you're sucking just a tiny bit of air through one of the banjos.

Another tip, I've heard of, but haven't tried yet.
Get a big syringe and push fluid from the caliper to the MC.
Since you're moving the fluid level uphill, air is pushed ahead of the fluid, as well.

You might also try wrap the bleeders in teflon tape,
to be sure they seal, when seated.

Another trick is to bleed it twice, the second time the next day.
This gives air a chance to perc up, through the lines, to the MC.

Hope this helps, Ern

P.S. Everybody hits a wall, on some project.
That's what got me hooked into the flow here, in the first place.
After getting a few answers, I started passing the karma along.

 

Yes I used new rings at the fittings. I just don't understand this mess. I'll get pictures tomorrow