Does the 126 have the bleed screw on the steering gearbox that the 114s have? Looks like a brake bleeder thingy. If so, I'd put a hose on it back to the res and run till no air comes out.

Michael

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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120