The hell am I doing wrong

[Pittenger5]

Replaced the caliper on my EX, been bleeding the brakes, put about 4 bottles worth of brake fluid through, used both a mityvac and the manual method STILL getting tons of air bubbles and little to no pressure on the lever. Is there any way I could be pulling air into the line without leaking fluid out? I cant see any leaks anywhere or what, but I know some bubbles are tough to get out, but this is ri-goddamn-diculous. Tons of tiny bubbles everytime I close and open the thing. Normally Id call this normal, but for how long Ive been bleeding theres no way somethings not wrong. Or Im an idiot. Either way.

[butcher bergs]

The bubbles you see is air coming through the threads when you crack the bleeder open (when using the mity-vac).


Try just attaching the tube, squeeze the lever and then crack the bleeder...

[Wishbone]

Could need a rebuild on the caliper or MC.

[Kurlon]

Ditch the Mighty vac for now. Put a long tube on the bleeder, and run it up to say, bar level, so you can push a nice long stack of fluid. Crack the bleeder just enough tolet fluid out with some resistance, and start pumping the master SMOOTHLY AND PREDICTABLY. Nice and slow. Be sure to watch your master and top it off as needed, never let it run dry. What you're looking to do is keep pumping fluid through to drive the major bubbles into your tube. Having a nice tall collum of fluid past the bleeder is the trick that lets you just pump the master instead of doing the squeeze-crack-tighten-release technique. Once the big bubbles are out, tighten the bleeder, drain and remove the hose, you're done with it.

Now to 'burp' the system in the other direction. The air bubbles will want to rise, the master being the highest point in the system. Get it off the bike so it's level, and leave the cap off. Work the lever by squeezing it just enough to close the return port, then release with a 'snap'. You should be getting tiny bubbles out the return port in the master when you do this. If they stop, work the lever fully a few times, then go back to burping. Once you stop making progress, put the cap back on , and walk away for an hour. When you come back, hopefully the remaining bubbles have migrated to the master and will escape out the return port when you pop the cap off the master and burp again.

[Pittenger5]

I will hafta give that a shot. I hope shit doesnt need a rebuilding...

[nerijusj]

Did you put a lid and tighten it on brake fluid reservoire after you fill it up? When I changed stock lines to ss lines on my bike, I couldn't get the pressure to build up in system with a reservoire open, I just kept filling it up, and it was all going out the tube. After I filled it up again and closed the cap tight, kept bleeding again then I started getting pressure in system. Could that be your problem?