no matter how you bleed your brakes you want to start out with fresh fluid in the reservoir. I use a Mityvac extraction pump to empty my reservoir.

Also, you'll notice an opaque plastic cover over the reservoir of new Mercedes models. This is a UV shield, so I've been told.

Wouldn't the reservoir and MC and ABS module see some exchange of fluid even if the remote line near the caliper saw no change? If they did see some exchange wouldn't periodic removal of the reservoir fluid prolong the life of the ABS module and MC.

For the power steering pump, removal and replacement of reservoir fluid by vacuum is good practice. From what I've read. What do you think?