BCM Community
Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Dreamscape on November 12, 2008, 02:27:43 AM
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Greetings,
I finished the installation of my new spring brakes! It was quite a job but well worth the effort. I pulled off the original DD-3's and TR-2 Inversion valve and went to town.
Installed a QR-1C valve in place of the inversion valve. This valve has a two-way check valve for anti-compounding.
Best part of this is, I have no leaks and they work great!
I have compiled a "How To Do" document, if anyone is interested I can post it. I have left it a single system for now, will tackle the job of changing it over to dual at a later time. Need to rest up, been under the bus since Sunday! ;D
Thanks to the help from Clifford (luvrbus), who gave me the idea and provided lots of support! Also to Sojourner for exchanging many emails and helpful links, and BusWarrior for his expertise.
This was installed on a 1968 Eagle 01, but it may help in other applications as well.
Paul
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Congratulations!! Looks great! Just curious, what are you going to do with the DD3 components? I might be interested in them . Jack
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Hi Jack,
Buswarrior said he wanted them a while back. If he doesn't take them you are next in line. Just pay the shipping and they would be yours. Or better yet stop by on your travels through Abilene TX. You know where that is right? ;D
Paul
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Hi Jack,
Buswarrior said he wanted them a while back. If he doesn't take them you are next in line. Just pay the shipping and they would be yours. Or better yet stop by on your travels through Abilene TX. You know where that is right? ;D
Paul
Thanks Paul, just let me know. So far, our travels have not taken us out of the Southeast. There is just sooo much to see in this country, we have not seen everyting in this part of the Country yet. But the Southwest is next on our list of areas to visit. Paula growed up in Arizona (Douglas-Bisbee area). Jack
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Good job Paul, you will enjoy the set up.Jack if you ever come to AZ I have a 50amp full hookup waiting for you (don't drink the water) good luck
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Glad that to see it done, so you can enjoy the convent of knowing of having no fear of hose breaking to stop and no fear of rolling. Thanks for the update.
It more fail safe than DD-3 due to what if the hose fail and parking pawl is not holding. Off course none of it to do any good if the brakes is not adjusted properly.
I have yet to finish the drawing of Eagle and MCI dual brake system but soon as possible, the Lord willing.
BTW…it includes spring brake for MCI’s. The newer spring brake can are more stream line to fit in then the older version.
FWIW
Sojourn for Christ, Gerald
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Paul, I noticed that you changed your profile. Why? I will say that you picture is neat.
You could email me that doc that you made. I would be interested. You have my email.
God bless,
John
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Hi Paul,
Looks like a great accomplishment. Congradulations!!
I am not familiar with the terms "single system" or "dual system" would you please explain their meaning? I like to learn something new.
Thanks, Sam 4106
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Paul,
More pictures when you have time. Did you add an emergency release system?
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When you changed the brake cans did you also have to change the slack adjusters? If you did, did you go with auto slack adjusters?
I know there is a lot of debate aroud manual versus auto slack adjusters. Are there any new vehicles that don't have auto slack adjusters? My bus is a 1995 so it has both spring brakes and auto slack adjusters from the factory.
I'm asking mostly out of curiosity here.
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Paul, I noticed that you changed your profile. Why? I will say that you picture is neat.
You could email me that doc that you made. I would be interested. You have my email.
God bless,
John
Hi John,
I will send you the doc so you can study the system. I changed my profile because of personal reasons.
The picture is of our Eagle in the background with the Dixie Echoes having some fun! Thought it would be good for a change.
Hi Paul,
Looks like a great accomplishment. Congradulations!!
I am not familiar with the terms "single system" or "dual system" would you please explain their meaning? I like to learn something new.
Thanks, Sam 4106
Hi Sam, Single system is referring to the old way air brakes were done. In the early 70's a change was made, so they designed a dual system, with the addition of two-way check valve between the primary and secondary tank, so if either the front or rear fail because of an air leak you will be able to stop your coach safely. For instance say the front has an air leak, the front tank (secondary) would draw down while the primary tank is still pressurized at whatever your compressor is putting out. The two-way check valve would close on the secondary side, because it has a lower pressure than the primary tank. Same in reverse.
Is it clear as mud? ;)
When you changed the brake cans did you also have to change the slack adjusters? If you did, did you go with auto slack adjusters?
I know there is a lot of debate aroud manual versus auto slack adjusters. Are there any new vehicles that don't have auto slack adjusters? My bus is a 1995 so it has both spring brakes and auto slack adjusters from the factory.
I'm asking mostly out of curiosity here.
Hi Belfert,
I did not change to automatic slacks, I have manual and I like them. It forces you to go "Down Under" and visually check the system out.
Not sure about "all new vehicles", probably.
Paul,
More pictures when you have time. Did you add an emergency release system?
Hi Lee, Not sure what you mean by "emergency release system". Do you mean a two way valve hooked up to the parking brake tank?
If so I have not done that, it will be done when I complete the project going to a dual system.
Happy Trails to All,
Paul
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More pics.
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Belfert; we order our new trucks with automatic on the front disc brakes an manuals for the drum brake,the loads we haul the automatics have tendency to keep the brake to tight and generate to much heat for us. Converting to to automatic adjusters for Paul would be very expensive he would need new s cams because of the splines on the automatic adjusters have a great day
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I didn't know if the slack adjusters needed to be replaced when doing the upgrade. If I had manual slack adjusters and they worked I wouldn't replace them.
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Paul,
A separate tank and valve to release the spring brakes once or twice, so you can move the bus out of a dangerous spot.
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Hi Paul,
Thanks for the explanation. I was not aware of the difference. You did a good job educating me.
Thanks, Sam 4106
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Sojourner,
Please if possible email me a sketch of the MCI 9 duel system. Do you have a part# on the newer spring break?
Thanks John
Paul,
Looks great, did you have to run more tubing? Do you need to add a tank for the duel system?
Thanks John.
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Hi John,
I did not have to run any tubing, at least not yet. I will when I convert to a dual system. The only extra tank I may consider is one for an emergency resevoir in case I have a real problem. When I do go to dual, I will make the primary resevoir for the rear and the secondary that is located in the front. for the front brakes. Other than that I'm very happy. Now I need to take it on a run a find out for sure.
Paul
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Paul,
Excellent photo doc.
Thanks for taking the time.
John
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Paul,
When you say dual what do you mean?
I am familiar with the system installed on one of my 04,s. The air supply comes from the front tank up tp the dead man switch, then on to the spring brake cans, This is over and above the normal brake system.The dead man also has a tube that exughsts to the outside, to dump the air. Also there is a one way valve that is positioned were the rear spring break hose splits.
John
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Hi John,
Here is the best I can explain. This was taken from a source on the net I found.
"Most air brake equipped vehicles on the road today are
using a dual air brake system. The system has been
developed to accommodate a mechanically secured
parking brake that can be applied in the event of
service brake failure. It also accommodates the need
for a modulated braking system should either one of
the two systems fail. It is actually two brake systems in
one, with more reservoir capacity resulting in a much
safer system. At first glance, the dual system might
seem complicated, but if you understand the basic air
brake system described so far, and if the dual system
is separated into basic functions, it becomes
quite simple.
As its name suggests, the dual system is two
systems or circuits in one. There are different
ways of separating the two parts of the system.
On a two–axle vehicle, one circuit operates the rear
axle and the other circuit operates the front axle.
If one circuit has a failure, the other circuit is
isolated and will continue to operate."
What you are referring to is like the emergency valve that Lee was discussing. I like what you call it better "Dead Man" switch. I think we are talking about the same thing, just your is set up different. Do you have a schematic showing the plumbing?
Paul