DD-3 air brake primer

[bevans6]

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

[lostagain]

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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[ol713]

   Hi all;
      I too would be interested.  I believe my DD-3s are leaking now and
      some info would help.     (70 MC-7)
                                           Merle.

[chessie4905]

    GM covers it pretty well in their coach service manual, but any and all info is welcomed.

[Debo]

Hey Brian,

I'd be interested in reading that. Thanks for adding to the knowledge base.

[bevans6]

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