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Here is an update of the problem. I think I have the brakes working again. HA!! :driver: I put some air tool oil in the emergency glad hand(as SS rrrr had said to do) I also took the valves apart that are on the driver side step and cleaned and air tool oiled them. SS halftrack told me that...

rrrr, The abs light comes on and then goes off when you move the switch to run and you can here the valves (or relays) actuating. I think I will unplug them or undo the power. Do you know were the ABS control box is? I will out of town for two or three days and not able to work on the truck...

Well did more testing. Went out put air into rear emergency glad hand with a little air tool oil. Rear Brakes are caged. Pushed on the brakes a number of times and all worked fine. Air coming out of both Primary Relay Valve vent and Secondary relay Valve vent. Started truck,, pushed on...

rrrr, Thanks for more things to try. I have used the glad hands for trouble shooting on other trucks. I will try the air tool oil all so. I got the truck from GL the first week of Nov. and it was rebuild 7/2010 by Fort Riley, KS. But it had a starter problem and a fuel problem so it did sit...

The brakes stay applied after you press on the brakes. Thanks.

Thanks Guys for all the inputs. Have not had much more time to work on it, today is my wifes Birthday. With the brakes caged, the rear brakes lock up, not the fronts. I did notice this morning that when the brakes are working the relay valve is letting air out. When the brakes are not...

Went out this morning looked at some things. Started truck, checked brakes worked ok. Started to drive around our block, got about a 1/2 mile and the brakes locked up again. I am starting to think it maybe the ABS system. Is there a way to disable the ABS system?

Nonotagain, Thanks!! But it was on all four rear brakes and not the front.

F18hornetM, Thanks for the reply and ideas to look at. I did notice that the front brakes did not get hot.

I had a problem with my M923A1 today. The service brakes are not releasing. I went into town to the post office (about 10 miles) and I noticed that the truck was not getting up the speed. When I got to the Post Office I noticed the rear brake were hot. I let them cool as I tried to find out...