Date registered: Jul 2009
Vehicle: 1964 Mercedes 220Sb
Location: Muskegon, Michigan
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I really thought a '61 220 would be setup like a '64 220, but your car uses the older style brake system...
I really don't know much about that setup...
ok... reading my manual, you have 1st version ATE power brake T 50 system.
Mine is the T51...
As far as I can tell you have a master cylinder and a supply cylinder (master on the left, supply on the right) mounted next to each other on the firewall. The entire unit located in the front of the car is the brake booster (or as the manual calls is "T 50 Power Brake"). The booster in that car maintains a certain amount of pressure in the hydraulic system of the car at all times, unlike a modern day system where pressure is present only when the pedal is pressed. The leak out of the weep hole probably indicates the booster is bad and since it maintains a constant pressure, the fluid will leak out regardless if you use the brakes or not. My manual does not cover any maintenance procedure if there are any, sorry.