Originally Posted by John Hopkins
Don't they attach to the nipple and force the fluid back up the line into the master cylinder, and if so wont that push any air from the banjo into the master...
this is a vacuum only system: attaches to the nipple and sucks down through from master through lines and out the nipple. I have seen pressure systems but not this one. I used it last fluid change and had no problems and simpler than gravity or bleeder valve or brake lever method.