Hello all,
I have a 1983 300SD that needs to have the brake system bled. I attached my homemade pressure brake bleeder to the master cylinder, but when I did, fluid leaks out from the area of the two switch reset buttons on the reservoir. Can this be repaired or do I have to replace the reservoir? I have done this several times on a 300D with success so I know that the bleeder works.

Anyone else experience this?

I'm hoping that the seals around the switches can be changed instead of the whole master cylinder reservoir. Any help is greatly appreciated. Thanks.

I recently removed the MC with the booster from my '82 300D. I can't see how those buttons are removed. Ugly, works, it's for sale.

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83 SD

84 CD

OldSD,

Did you solve your problem? I am re-doing the brakes on my 107 chassis, and I experienced the same issue when trying to pressure bleed the system- hook it up, and fluid flows pretty readily out of the master cylinder reservoir- took awhile for me to notice that the two plastic caps with low fluid level sensors (on either side of the reservoir fill cap) are split at the threads. Must be where the fluid is coming from when the reservoir is pressurized.

Again, were you able to solve your problem w/o replacing the entire reservoir? Different chassis cars, but the brake systems are pretty similar through the years-

Thanks! JAS

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94 E320
71 350SL

The caps on the left and right (not the center) are the ones in question:

Attached Thumbnails

 

Jas,

Nobody chimed in with any past experience. I ended up just replacing the reservoir.

Yup, I bit the bullet and ordered a new one, too. Thought about checking salvage yards and the like, but decided that if the reservoir is in such bad shape on mine, a junkyard example wouldn't be much better.. So, shiny new reservoir on the way! I plan to have this car long enough that replacing seemed like the way to go. Cheers, JAS

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94 E320
71 350SL