I am glad you got it resolved but for others in the future, you are supposed to fill reservoir and the Motive Brake Pump with fluid, which when pumped, simply pumps fluid in as you go...that way you never have worry about this. The whole purpose of the system is not to pump air into the system.

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1987 300TDT - 195,000 (Original #14 head)
1993 190E 2.3 - 105,000
1981 300D - 250,000