Quote:
Originally Posted by roverbarmy
I meant to empty the master first to avoid taking any contaminated fluid from the master through the system, then only fresh fluid is pushed through. A bit belt and braces really. The fluid in the master just shuffles backwards and forwards in normal use. It does not travel the whole length of the pipe (ie circulate like water in a central heating system) unless you are draining or bleeding the system.
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It does only go back and forth, but it will eventually mix, plus any dirt grit an bits of worn seal will make its way down to the slave.