Below is an answer to the brake fluid circulation question I found online. From my own experience, I have seen new fluid refilled in the reservoir gets dirty quickly, which seems to validate the claim too.
"Yes. There is a lot of movement.
Some more than others, and an ABS system isn't certain.
At the shop we have performed and recommended turkey baster type flushes for people with economic restrictions. It usually helps or fixes some problems, and is certainly good maintainance.
My latest experience was a Chevy work truck. We had the owner suck out his master cyl and clean it, then refill with fresh fluid every couple of days. It would get black rapidly, then started to clear up, and his rear brakes started working properly again.
Of course bleeding the system is faster and better. But we have to deal with people with no money and broken off rusted bleeders.
I turkey baster my personal vehicles as a regular maintainance procedure
-quick and clean for PS and brakes."
I guess it's better than doing nothing, but I'll stick to the method that every mechanic I know of has used for decades. I can't see the logic of circulating contaminated brake fluid through the system when it's relatively easy to avoid doing so.
'16 Turbo,Sapphire,Black Leather Int/Sport Classics/Window Trim/Roof Rails/Xenons, PDLS+,Tinted Tailights,Sport Design,PSE/PTV/AS/SC/ACC,Burmester,Prem/Comfort Lighting Packages,Leather Dashboard Trim,Seat Console,Steering Column,Rear View Mirror and Sun Visors, Leather Interior Trim in Pebble, Pebble Seatbelts, Headrest Crests, Armrest Logo, White Dials/SC Clock, Alum Fuel Cap, Spt Design Mirrors, Surround, Connect/Online Services,Painted Key,Leather Keypouch,Illum Door Sills