REFLECTOR: air in break line

[Brett Ferrell]

Barry,


I've really struggled with bleeding as well.  I really liked the Aircraft
Tool power bleeder, but it seemed to be putting entrained air into my
lines.  What I did to resolve this was to get a smaller oiler can and just
replace it's hose with tygon that fit over it's outlet and the bleeder
nipple.  This lets me force fluid in from the bottom of the brake without
adding any air to the system.  This seems to work pretty well.  In
addition, the cylinders really like to trap air, so I get the system full
and then vibrate the pedal assembly vigourously to get the bubbles to move
out of them, bleed some more, and then repeat this process several times.


I've found that this works well, but I will still have to vibrate and bleed
a bit more on two or three consecutive evenings to really get all of the
air out - every night there would be one bubble that had escaped from the
cylinder.  But I was able to get very firm brakes with this technique, and
nothing else really worked for me.

Brett


> Hello

> For about two month I have been trying to bleed my left break. I replace
the master cly. Three times, rebuild the caliber twice; replace break line
to gear leg and still getting air in the line. No sign of fluid leak. It
looks like it coming from the master cyl. After I reverse flow and no
bubbles I stop. Then when I push on the brake you can see a bubble come
from Master cyl. You wait until the next day you can see more air in the
line. But changing it three times it has to be something else. Any
suggestion on what I can try or where the air might be coming in from. I
have done reverse flow and pumping break and bleeding at caliper.  > Barry
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