When I do this, should I open the cap on the MC, as well as all the bleeders screws? Thanks.

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1989 300E 144K

Bump.

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1989 300E 144K

Sure, take the cap off, on the reservoir.
Keep an eye on the fluidlevel ( as it's going down too ).

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2007 C 230 Sport.

I've tried this hoping to "bleed" out some air. Didn't help much. Ended up being more of a "flush" than a "bleed".

I believe the success of a gravity bleed is proportionate to the complexity of the cars brake system.

Just my 2 cents.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"