Originally Posted by shott17
Is this because they pull instead of push?
yep, but more specifically
It's because it's an internal slave right on the release bearing. So the blead nipple is prior to the slave. (in between the slave and the resivoir) The vaccum will pull the air out of the slave and the resivoir, but if you just pump the peddle it won't get that far. You will just pump it through some line and out the bleader.