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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: bevans6 on November 17, 2014, 06:45:58 AM

Title: DD-3 air brake primer
Post by: bevans6 on November 17, 2014, 06:45:58 AM
If anyone is interested I will write a "primer" on how a typical DD-3 based bus air brake system works.  It will be based on my 1980 vintage MCI, but should be applicable to most similar DD-3 based brake systems.

Brian
Title: Re: DD-3 air brake primer
Post by: lostagain on November 17, 2014, 06:58:43 AM
I would be very interested. Many other bus nuts have '70s and '80s MCIs with DD3s. Didn't you rebuild yours? You could write about that too.

JC


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Title: Re: DD-3 air brake primer
Post by: ol713 on November 17, 2014, 09:09:43 AM

   Hi all;
      I too would be interested.  I believe my DD-3s are leaking now and
      some info would help.     (70 MC-7)
                                           Merle.
Title: Re: DD-3 air brake primer
Post by: chessie4905 on November 17, 2014, 09:28:14 AM
    GM covers it pretty well in their coach service manual, but any and all info is welcomed.
Title: Re: DD-3 air brake primer
Post by: Debo on November 17, 2014, 10:11:01 AM
Hey Brian,

I'd be interested in reading that. Thanks for adding to the knowledge base.
Title: Re: DD-3 air brake primer
Post by: bevans6 on November 17, 2014, 11:23:39 AM
It's posted as a separate topic.  I didn't rebuild my DD-3's, I took them apart, they were totally trashed (although still working, I have no idea how) and I bought new ones.  To me, a big issue with just replacing diaphragms in a DD-3 is the locking port mechanism can be total junk and just waiting to fail, and if you take it apart it basically never goes back together, after a certain age it just disintegrates.

Brian
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