Originally Posted by compu_85

When I flush brakes that haven't been flushed in a long while I like to pull the screen out of the master res, suck most of the fluid out with my Pella pump, then wipe as much of the goo in there off as possible, being sure not to leave any chunkies that could get stuck in the ABS system. I then refill and bleed with cheap DOT 3 fluid (new DOT 3 fluid has a higher boiling point then ~3 year old DOT 4 fluid). Then I drive for a while as all the crap still sitting in the system gets absorbed by the DOT 3. Then, I rebleed with some quality DOT 4.

-J