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Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 102 Post(s)
On a 108, there is a bleeder valve that looks just like that on a brake caliper and it's on top of the steering box. The procedure is with the car running and while refilling the reservoir as necessary, have the bleeder valve open and watch the fluid come through a clear plastic tube noting air bubbles if any. Turn the wheels lock to lock gradually and see if more bubbles appear, make sure you don't run out of fluid in the reservoir or you start over. I think it only takes one iteration of lock to lock to purge the system of air.
I have no idea if it is the same/similar on a 116 (if that is what you have). But the bleeder valve will not look like something other than a bleeder valve.
Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...