You can even top it off
The CD ROM Manual says that (after bleeding the system) if the customer complaines of a spongy feel to top off the reservior. I didn't think the reservoir held pressure, but it is right in the manual.
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si