brake flush

[mountainman]

getting ready to flush and change the brake fluid in all 3 of the porsches.. Got the super blue, got the motive pressure bleeder and plan to do all 3 plus an suv and 2 ATV's back to back. Am going to use the motive filled with fluid just as it says. Was wondering if when the flush is finished and I am unscrewing the motive cap from the brake fluid reservor there will inevitably be some leakage since the reservoir and the lines will be full. Is there any way to prevent that, as maybe release the pressure in the motive and then let just a bit more fluid out of the last bleeder valve before removing the reservoir cap?
how does everyone address this to avoid spilling fluid down around the reservoir?

[husker boxster]

I release the pressure at the Motive bottle first.

[ChrisZang]

I NEVER put any brake fluid into the motive bleeder.
Just watch the fluid level in the brake fluid reservoir and you're good to go w/o any mess

[stephen wilson]

Yup, release the pressure at the Motive tank, and fluid in the line will drain back. I didn't spill a drop. The Master doesn't become "liquid full", It maintains an air gap as usual, only drawing the same volume of fluid as is bled out.