Per the instructions, the A.B.S. brake bleeding must be done at 2 bar to open the valves. However, the two electrical connections are not allowing any pressure to build up. Must I replace the brake reservoir?

B.T.W., this is for a 1985 280TE.

Thank you in advance for any help!

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Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.