Not related to speed IF the lamp went off with-out cyclying the key.
IF the lamp went off while driving then POWER supply would be the problem!
Most likely is the voltage supply relay in the hydraulic unit. The overvoltage relay can also cause that problem. ALSO the charging system(alternator) may be to blame!
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MERCEDES Benz Master Guild Technician (6 TIMES)
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1986 190E 2.3 16V 2.5 (sold)
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