M818 brake issue

[Chief Gantt]

I have a m818, the brakes are gradually locking up the more you apply them. I have constant air coming from the service gladhand at the rear of the truck instead of when you just apply the brakes. I did get some brake fluid from the rear drain on the back side of the airpack under the shuttle valve. I have ordered a rebuild kit, just looking for others who had the same issue to ensure that I’m not just seeing airpack and maybe have a stuck shuttle vavle too. Master cylinder isn’t sticking, the operating rod from the pedal to the master cylinder has very little slack.

 

[msgjd]

check the adjustment on the op rod to the MS .. the TM will tell you the number .. I did not refer to the TM once and adjusted the rod to have less pedal play, and it ended up being a mistake as it got tighter and tighter with repeated applications, to the point the brakes would drag until enough time had passed for things to release ... not saying that is the problem , but it's a place to start if there is not much play in the pedal even after truck has sat overnight

 

[Chief Gantt]

check the adjustment on the op rod to the MS .. the TM will tell you the number .. I did not refer to the TM once and adjusted the rod to have less pedal play, and it ended up being a mistake as it got tighter and tighter with repeated applications, to the point the brakes would drag until enough time had passed for things to release ... not saying that is the problem , but it's a place to start if there is not much play in the pedal even after truck has sat overnight

I checked and it’s adjusted correctly

 

[msgjd]

does your front gladhand cover have a vent, and is that vent clogged?

 

[Chief Gantt]

does your front gladhand cover have a vent, and is that vent clogged?

Yes vent is there and not clogged, but I need to get someone to hit the brake so I can see if it’s exhausting out there.

 

[Superthermal]

Yes vent is there and not clogged, but I need to get someone to hit the brake so I can see if it’s exhausting out there.

This front glad hand being shut off and not open on my rig was my brake problem. Took me some time to figure it out!