M932a1 Rear Brakes Stuck

[dabtl]

I have no idea what I am doing with this. The brakes appear stuck at the rear. Never worked on brakes such as this before.

Any ideas on where to start?

 

[M35A2-AZ]

I know this sounds off the wall, but make sure your vent on the front services side glad hand is open and it is working.
If there is a ball valve there open it. the truck needs to vent out the front service glad hand when you release the brakes.
It happened to me and that was the problem.
If you drain all the air out of the truck and then air it back up does it work ok then?

 

[73m819]

Are the spring brakes set, thought the 939 series vent out the stack among other places but not the front glad hand like the 39 and 809 do/

 

[pctrans]

Chock the wheels; release the brakes; Bang the shoes with a small sledge. They should release. The tractor brakes are more prone to stick due to exposure to rain, thus rusting to the drum.

 

[Jeepsinker]

X2. I use a ten pound sledge though. I have 22 of these trucks here and this is a constant fight. If you do use a ten pound hammer, don't use a full swing or you'll damage the drum.

 

[M813rc]

As mentioned above - bang with the sledge, put it in gear, rock it a bit and see if will break loose, repeat as necessary. Be gentle with the "put in gear" and rocking part.
One of my 931's does this almost every time I drive it, the other has never stuck.

Cheers

 

[Jeepsinker]

Usually they break loose easier in reverse. I'm not sure why.

 

[dabtl]

OK, face palm self, remembering when the M35 starter would not engage. Push starter button tap with ball peen hammer, truck starts.