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Parking break release

This forum will archives technical threads that are unique to Eagle Buses. There will be one thread for general comments, but the technical threads will be locked. The intent is to have a repository for detailed technical information that can be of prime importance to an Eagle Bus Owner. New threads can only be created by the forum administrators.
Parking break release
Fri Feb 01, 2019 12:51 pm


I have a 1979 eagle and cant get the parking brakes to release.I have replaced the quick release valve but still will not release. There are no holes in the canisters to cage the brakes, is there another way to release so I can move to a repair shop? I get 120 air back and front on gauges, go thru normal release operations still will not release. Drums are not frozen.
Jm79eagle
 
Posts: 6
Joined: Wed Sep 13, 2017 9:51 am


Re: Parking break release
Fri Feb 01, 2019 9:57 pm


Try running the engine until full air pressure is built up (120 psi), push in the brake release knob, then apply the brake pedal until 100 psi is achieved (you might have a separate brake application pressure gauge). That should do it if everything is working correctly. Since it is cold nowadays, icing might be interfering.
Walter
Dayton, Ohio
1975 Silvereagle Model 05, 8V71, 4 speed Spicer
1982 Eagle Model 10, 6V92, 5 speed Spicer
1984 Eagle Model 10, 6V92 w/Jacobs, Allison HT740
1994 Eagle Model 15-45, Series 60 w/Jacobs, Allison HT741
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DoubleEagle
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Location: Dayton, Ohio


Re: Parking break release
Sat Feb 02, 2019 6:57 am


Have tried that numerous times still not releasing.
Jm79eagle
 
Posts: 6
Joined: Wed Sep 13, 2017 9:51 am


Re: Parking break release
Sat Feb 02, 2019 10:53 am


Well, in that case, particularly since you probably have the DD3 system (and not the spring chambers that can be released with the threaded rod), you are in for a bunch of diagnostic troubles. The Bendix manual at http://www.suspensionspecialists.com/te ... k_2009.pdf, can give you an idea of all the components involved. The DD3 system was constantly changing in the 70's, and is overly complicated. This is why many change from DD3 to spring brakes. Check the archives on this forum and on Bus Conversion Magazine's, this kind of problem has been discussed before. Basically, the DD3 chambers are locked mechanically and are not getting the correct air pressure to release them because of failed relay valves or other mysterious DD3 components. You will probably need a mechanic that understands these systems well, otherwise you are paying for some mechanic's education. Going to Spring Brakes seems to be preferable. :?
Walter
Dayton, Ohio
1975 Silvereagle Model 05, 8V71, 4 speed Spicer
1982 Eagle Model 10, 6V92, 5 speed Spicer
1984 Eagle Model 10, 6V92 w/Jacobs, Allison HT740
1994 Eagle Model 15-45, Series 60 w/Jacobs, Allison HT741
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DoubleEagle
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Location: Dayton, Ohio


Re: Parking break release
Sat Feb 02, 2019 6:58 pm


Jackie, With the brake knob pushed down, are any air leaks heard especially near or from the DD3 canisters? Also, when the foot treadle is pushed, does the rod move at the brake adjuster? Do you know if anyone has stood on the brake peddle during full air pressure with the parking/emergency knob pulled?


Jim
Jim & Denise
"Casper" Eagle 01 1966
"Eagle 2" Model 15 1989
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Jim H
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Location: Talladeda Township, AR


Re: Parking break release
Thu Feb 07, 2019 1:03 pm


Jackie, I see you are in Arkansas. I think it got pretty cold there. As someone mentioned, you could have had an icing problem in the airlines. If that turns out to be the case, you will need to service your air dryer or install a new one.

Now that it is warmer, did you get the brakes to release?

BTW, I always suggest that folks set up a signature in their profile. If your location/model/engine/etc is included, it makes it a bit easier for us to help.

Jim
Jim Shepherd
Evergreen, CO
'85 Eagle 10 with Series 60 & Eaton AutoShift 10 speed transmission - not at all fancy, but fully functional
Bus Project pages: http://beltguy.com/Bus_Project/busproject.htm
Blog: http://beltguy.com/blog/
Email: jim@eaglesinternational.net Note: Email sent to the this address requesting technical advice will not receive a response
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beltguy
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