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DIY brake fluid?

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You don't need to. Returning the pedal to neutral pulls a very minimal amount of fluid back into the caliper (1-2tbsp), and it's just the same fresh fluid being reintroduced anyways. You're good to go as long as there's no air bubbles. Occam's Razor is a principle that's served me well over the years.

Well. You Sir, have the fine tuned skills of working the pedal and opening the valve just enough. :)

I have experienced air bubble getting drawn back in the the calipers when its not closed or not using Speedbleeder valve.
 
At a shop environment the Steirius has been the greatest electric bleeder with 10 liters of capacity. No issues for 17+ years. With so many requests for different brake fluids the Mityvac MV6840 has yield years of trouble free service and very affordable. You will not run out of fluid with this one, even when trying to flush the ABS/DSC system. If used daily, the hose will need to be replaced every 6 months.