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  #1  
Old 09-08-2012, 06:33 PM
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Join Date: Aug 2010
Posts: 26
Problem Bleeding Brakes w124 1992

Started the day with the idea that I should do a simple brake fluid change before the weather turned to chilly, if it ever does this year. Anyway, the plan was to pull about 80mL of fluid through the passenger rear bleed valve with a mity vac hook-up. About 40 mL came through then bubbles then just air. The volume in the reservoir didn't decrease any visually. Tried for at least 30 minutes and just got air with no change in the reservoir. Then tried the driver rear and had the same thing happen. However, if I bleed the front calipers fluid come through and the reservoir goes down.

What did I do wrong and how can I fix it?

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  #2  
Old 09-08-2012, 07:26 PM
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Location: Washington, DC
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My '92 has a 2nd reservoir behind the main one. They are separated by a plastic inner wall. You have to ensure the brake fluid level is very high to allow it to fill the 2nd reservoir. I believe this is the rear brakes and can bleed dry if you aren't careful.

-John
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  #3  
Old 09-08-2012, 09:07 PM
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Join Date: Oct 2011
Location: Columbia, SC
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Ya wants to be pushin not pullin that brake fluid....

Buy or make a power bleeder out of a pump sprayer.

I just did it last weekend, with a power bleeder, works a treat.
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2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

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  #4  
Old 09-09-2012, 09:59 AM
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Join Date: Sep 2010
Location: Eastern PA
Posts: 285
Had similar issues w/my 300D. Check this thread for some ideas Need help w/W124 brakes - Benzworld.org - Mercedes-Benz Discussion Forum

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