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M923A2 Spring Brake actuator

Rifleman

New member
249
2
0
Location
HOT Arizona
Higgs, when i first got my truck i had the same problem with the E brake air switch. Mine was stuck in the up position and my truck wouldn't move an inch. Once i flipped that arm with the roller on it down the brakes released. From time to time mine will still stick, but i now make it a practice to check to make sure it's down when i push off the E brake.
 

maxtor

New member
274
3
0
Location
California
This same issue happened to me today. Our M923A2 has been working perfectly until today. I started it up, waited until the air pressure built up, and then released the parking brake, moved the trans shifter from neutral to 5-1. The truck would not move forward. I could move in reverse, but it was obvious that the brakes were on. I called a fellow friend and he suggested pushing in the override knob. It worked and allowed me to move the truck normally in forward and reverse. Of course the light was on that indicated a parking brake problem. I moved the truck to it's normal parking place, then pulled out the knob to normal location, which locked up the brakes. It was getting dark by now, so I will check it out tomorrow after reading more on the TM's. I did notice that the roller that lifts when you pull the parking brake up would move up and down with ease.
I am glad I found this thread.
 

Jlprober

New member
19
3
3
Location
Jacksonville,FL
I just experienced the same issue everything working fine then the brakes will not release once pb lever is moved to the down position. So i tried playing with the wheel (flipping it up and down several times) to no avail. Do these switches go bad frequently and if so how do i diagnose the switch as bad and not something else? Thank you in advance for your help.
 

maxtor

New member
274
3
0
Location
California
I fixed ours by removing the valve, using wd40 and air to clean out the valve. Works like new now. If you want verbal instructions, leave me a pm with your phone number and I will call you.
 

Jlprober

New member
19
3
3
Location
Jacksonville,FL
Thanks Ken and Maxtor for taking the time for me. I took mine off and squirted teflon oil on the plunger of the valve and it works great!! 15 min. job
 
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