I agree with kbp on this. Whenever possible, any hydraulic system should be bled with a single person and a constantly open bleed valve. The absolute ideal system if you don't need to flush is to route the bleed line back to the master cylinder of whatever unit you're bleeding, but that isn't always possible. Much easier and more reliable than working with two people and constantly opening/closing the bleed valve.

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1987 Mercedes 300D