I hope you know that the two master cylinders are different. There is one for the clutch inside the car and one for the brakes on the outside. The clutch is an entirely different system than the brakes, thier only common factor is the brake RESERVOIR. If you have no leak of fluid from the bottom, you probably have a faulty master cylinder. (it is inside under the kick panel/

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Benzmac:
Donnie Drummonds
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM