That's actually what I did also but I didn't want to complicate the post. I
fitted

- air fitting to a spare filler cap

- air fittings to old 0-30 lb regulator

- 2 short air hoses

- a small old sprayer tank

(all of which fits in a deep rollaway drawer)

So I can go

a. air supply -> regulator -? master-cyl reservoir; or

b. air supply -> regulator -> tank -> master-cyl reservoir


I usually just do (a) when bleeding because it's not onerous to refill the reservoir after each caliper. And no reason to risk contamination from the tank.

But there are times I want to flush a system - usually an old truck but sometimes a 240 with lingering soft pedal - by forcing fluid through rapidly.
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240 drivers / parts cars - JH, Ohio