what is the master cylinder?

I'm not too familiar with this.

The car is at my house and i'm at school now. I should be home around 9ish, i'll try it then or ask my mom to try it for me.

Check this post again, i'll send you a PM when i check it. Thanks man.

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Own:
2013 C300 4matic
2009 C300 4matic

Owned:
2001 E320 Sport
1992 500E
1989 300SEL