No way a test strip dipped into the master cyl reservoir is showing condition of brake fluid in the calipers.

Any moisture in the system will collect at the lowest point (calipers/lines), because of the different specific gravity between brake fluid and water.

An incomplete flush can leave old "wet" fluid in the ABS module/lines/calipers and the test strip will ONLY verify the dry/new fluid on top.

Moisture test strips only work to verify fluid moisture in a system that circulates the fluid, automotive hydraulic brake systems compress the fluid, ZERO circulation.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!