I built one of these pressure bleeders (sans gauge) last year to help in bleeding the clutch on Marlene after the transmission install. Since then, I've used it 2-4 times, the most recent being yesterday when I did a flush on Lilly's ('84 300D) brakes. I hate having anything to do with brakes but IMO, the bleeder is the best thing since sliced bread.

There is a caveat: some reservoirs have a 'breather' hole in their top (my W115 for example) and pressurizing the system with this sort of bleeder makes a HUGE mess of spilled and dripping brake fluid. Be sure you clean up your mess or you'll be missing paint.

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Never a dull moment at Berry Hill Farm.