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I can understand that, however after the suction was gone, the bubbles were still in the line and they pumped through on the next stroke. I guess I could see it if they immediately disappeared as soon as there was pressure in the line again.
I totally understand what you are saying. I'm just trying to wrap my head around this whole thing. And it one of those things that you get one chance of the entire system being completely clean. I don't want to have to take everything back off and apart to clean out fluid to change it back over. Just trying to make the right decision the first time.
I've been running with DOT5 for many years, haven't noticed the issues you mention. Have you tried the same experiment with Dot3/4? Bubbles show up when rapidly pumping with Dot3/4? Curious. I'm wondering if you may be seeing the same phenomenon where lip seals in the calipers are known to pump air into the system if the rotors are out of spec causing rapid pumping? Nothing to do with which DOT fluid is being used. I'd be interested in hearing whether changing to DOT 3/4 cleared up the bubble issue.