Brake Servo Help - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 06-24-2011, 03:27 PM Thread Starter
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Date registered: Mar 2006
Vehicle: 1995 E320, 1961 220Sb
Location: Chicago
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Brake Servo Help

Hi, I have a '61 220Sb that I recently got in my possession. When I got it it had no brake fluid in it, so after refilling the system and attempting to bleed the brakes I noticed that fluid was leaking out of a small weep hole on the T50/26 brake booster. When i checked back on it the next day...all the fluid had poured out. Any ideas on what the problem is and/or what that little weep hole is for. I'll try getting a pic of that hole up a little later. Thanks
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post #2 of 5 (permalink) Old 06-24-2011, 05:48 PM
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Probaly the piston seal in your master cylider has gone to the Happy Hunting Ground, or in this case; Valhalla.


There may be rebuild kits available if you check with the Classic Center.


Good luck

Remember: It's not just a car. It's an Adventure.
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post #3 of 5 (permalink) Old 06-25-2011, 04:57 PM
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Date registered: Jul 2009
Vehicle: 1964 Mercedes 220Sb
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Mercedes W110 190C 200 230 200D Brake Master Cylinder | eBay

Better clean the Brake booster out with some brake cleaner or silicon lubricant spray before the brake fluid eats the seal away and you have to find a new one of those too...
A failed master cylinder gasket is the main reason everyone with a 220 is looking for a brake booster... I had to find one...

NEW-OEM-ATE-MERCEDES-BRAKE-POWER-BOOSTER-000-430-55-30

Mine was cheaper, but they're about impossible to find now.

Last edited by tgikal; 06-25-2011 at 05:02 PM.
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post #4 of 5 (permalink) Old 06-29-2011, 12:08 PM Thread Starter
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I have attached some pictures of the brake booster. It is a remote brake booster and its located in the front of the car. It seems like the brake booster has its own type of master cylinder separate from the actual master cylinder. So should I be looking for rebuild kits for the cylinder that is on the brake booster then? Also, I'm attaching pics of the brake booster and that weep hole I was talking about. Thanks for all the help so far.
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post #5 of 5 (permalink) Old 07-01-2011, 06:48 AM
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Date registered: Jul 2009
Vehicle: 1964 Mercedes 220Sb
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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.
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