I'm still waiting for a 0-60 psi air pressure gauge I ordered online ($1.99) before I give it a try..

I have a couple of questions:

Assuming there is air in the master cylinder, will bleeding the brakes with the power bleeder at the four wheel nipples be enough to take care of it?

After using it, how do I clean the master bleeder before storing? Soapy water?

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1979 240D, W123, 105K miles, stick, white w/ tan interior.