Car: Any W124

If you push back a brake piston while the master cylinder reservoir cap is still on what happens?

WIll it damage the MC? If you then remove the cap and pump the brakes, will that suck air into the system?

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black