Broken on I-70

[gumpy]

Hi Dave,

Posted an answer to some of your posts on the other board. Question if I have a blown diaphragm would that keep the system from airing up even a little?? Because however I try to get any pressure in the system I can't even get the gauge to twitch.

--Mike

No. The diaphragms are only under pressure when you apply the brakes. When you release the brakes, the spring on the shaft pulls the shaft back into the chamber.

[pvcces]

FolkBus , one thing might make troubleshooting difficult is the way different systems are interconnected. For example, in our 4106, the gauge will only register pressure that is in the auxiliary side of the system, and a big enough leak in the brake side of the system will prevent anything from showing on the gauge.

One way you can isolate the systems is step on the treadle hard while there is nothing showing on the gauge, then release the treadle. If you can hear the air release from the brakes when you do this, there is pressure in the brake system. If you can't hear the air release, then there is no pressure on the brake side.

If you study your manual's air system, you should be able to understand what I am getting at.

Good luck running down your problem.

Tom Caffrey

[Dave5Cs]

On another board he said there was air leaking out the R-8 valve in the back. His bags are up still which should be on his accessory tank so there should be air in it and the check valve is working on that system. Tells me its in the brake system or e brake system/ parking system, No? Scratching head also.

[FolkBus]

Hi all,

Found my issue and have a temp fix that is getting me home. I again want to thank everyone on all three of the boards that consoled, educated offered help and lectured me on my follies. The information has been great and has given me a much better idea on the workings and interactions of the MCI air system(s).  I am studying the manual for more education.

So as to not keep everyone in to much suspense it was a "massive" leak from a valve just off of the wet tank that feeds the rear leveling valves. The compressor and associated parts are working fine. As was mentioned in my lecture from Brian the air system of a 5 is a case of multiple personalities. Much more education in my future. In the mean time today was beautiful as I cleared 3 11,000ft+ passes with no problem. With a non turbo 8v71 there was lots of time to enjoy the view both going up and downhill. Misters are a wonderful thing.

Again

Thanks to all

--Mike

[Oonrahnjay]

Hi all,

Found my issue and have a temp fix that is getting me home.  ...

    Great news!!  And, for what it's worth, I went to a Bendix Brake School near my bus storage.  I learned *a lot* and it gave me info that allowed me to follow the brake system principles on my bus.  It was well worth the $300 and the week of classes. 

[luvrbus]

    Great news!!  And, for what it's worth, I went to a Bendix Brake School near my bus storage.  I learned *a lot* and it gave me info that allowed me to follow the brake system principles on my bus.  It was well worth the $300 and the week of classes. 

Lunches are not that great though  and they don't cover the DD-3 in great detail they don't even like to talk about 1