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  #1  
Old 10-07-2010, 03:14 AM
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No pedal but no loss of brake fluid.

On my 83 300D, I have little or no pedal but no loss of brake fluid. If I pump the pedal, I get a bit of resistance which quickly goes away. If I push the pedal all the way down, I will get some stopping but it's weak.

I'm thinking it's the master cylinder.

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1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)
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  #2  
Old 10-07-2010, 03:22 AM
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I'm thinkin' what you're thinkin'.
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  #3  
Old 10-07-2010, 03:43 AM
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definitely sounds like the master cylinder. Pretty easy job, just did mine a little while back. Definitely buy the correct flare nut wrench, worth every penny (and doesn't cost much more than that).
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  #4  
Old 10-07-2010, 04:35 AM
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That's the way my SDL was, no pedal resistance and no leaks. The master cylinder from my parts car fixed it.

P E H

Last edited by P.E.Haiges; 10-07-2010 at 04:37 AM. Reason: typo
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  #5  
Old 10-07-2010, 02:51 PM
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Answer

Quote:
Originally Posted by Codifex Maximus View Post
On my 83 300D, I have little or no pedal but no loss of brake fluid. If I pump the pedal, I get a bit of resistance which quickly goes away. If I push the pedal all the way down, I will get some stopping but it's weak.

I'm thinking it's the master cylinder.
Correct, the master cylinder has failed.

It is called internal bypass failure.



Fastlane: BRAKE MASTER CYLINDER, LESS RESEVOIR
http://catalog.peachparts.com/item.wws?sku=004 430 23 01
.
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Last edited by whunter; 06-06-2011 at 04:52 PM.
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  #6  
Old 10-08-2010, 06:58 AM
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Thanks all! I just wanted second opinions to go with mine.

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1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)
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