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Originally Posted by blueranger
for you arthur,
even though a brake system is a closed system the fluid circulates.
thats why your fluid is dark because the fluid circulates even in a closed system. Its called fluid dynamics.
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I'm confused.
What is the driving force that circulates fluid from the calipers back to the reservoir? The system has a dead end at each of the calipers. Last time I took Fluid Dynamics, fluids didn't circulate unless there was a flow path and a pressure difference. Replacing the reservoir fluid prior to bleeding the remainder of the system through the calipers may make sense to save time, but I've never bothered.