Not sure if you remember me picking up a load last winter in Logansport, IN. I couldn't get the tandems to slide when I picked that load up, and it was for the same reason. It was 15F that night and I had to use a wheel chock to get the tandems slid into the position I needed them in. The TA in Mt Vernon, IL sold me a bottle of brake anti-freeze, which seemed to help...but it didn't completely eliminate the problem. Ensuring the brakes were properly adjusted was one of the first things I did, but they still had this problem.
I assume you meant releasing the brakes and not setting them. I believe that could have varying causes - some of which could be concerns and some not so much. If it takes that long for the brakes to physically release, it could be a case of the trailer air reservoir being depleted of air and needing to fill back up first before all of the systems that are supplied by the reservoir fully pressurize. However, that does also raise the question of WHY did the reservoir get depleted. There's likely a leak somewhere. The questions are (1)which system is involved, and (2)is it audible? If no audible leaks are detected, it should be treated as a nuisance issue that doesn't require immediate attention. The brake valve in the tractor will only pop out if the pressures in your tractor air reservoirs drop into the 20-45psi range, barring an issue with the valve itself.
There are several possible contributors to this type of problem, and the video explains what some (but not all) of the possible causes are. It can also be caused by a bad trailer ABS/parking brake valve, bad S-Cams, bad S-Cam bushings, bad slack adjusters, etc. Brake chambers most often get replaced because of audible leaks - which won't have anything to do with this problem.
Crap that happened to me the other day. Try to slide tandems and wheels rolled with brakes set. You are right. Shop said it was a valve sticking.
Not sure if you remember me picking up a load last winter in Logansport, IN. I couldn't get the tandems to slide when I picked that load up, and it was for the same reason. It was 15F that night and I had to use a wheel chock to get the tandems slid into the position I needed them in. The TA in Mt Vernon, IL sold me a bottle of brake anti-freeze, which seemed to help...but it didn't completely eliminate the problem. Ensuring the brakes were properly adjusted was one of the first things I did, but they still had this problem.
What valve
@@Norris798I think it’s called quick release valve
I assumed it was ice in the line but the shop further investigated and determined a valve issue
What valve?
@@Norris798sr5 valve most the time
I didnt understant shit ... what is that, whatsthe part name, or how to fix it...
Thanks
What about setting the brakes and it doesn’t start rolling until like 30 sec or a minute later? Can the brake button in the cab pop back out?
I assume you meant releasing the brakes and not setting them. I believe that could have varying causes - some of which could be concerns and some not so much. If it takes that long for the brakes to physically release, it could be a case of the trailer air reservoir being depleted of air and needing to fill back up first before all of the systems that are supplied by the reservoir fully pressurize. However, that does also raise the question of WHY did the reservoir get depleted. There's likely a leak somewhere. The questions are (1)which system is involved, and (2)is it audible? If no audible leaks are detected, it should be treated as a nuisance issue that doesn't require immediate attention.
The brake valve in the tractor will only pop out if the pressures in your tractor air reservoirs drop into the 20-45psi range, barring an issue with the valve itself.
@@ScottZane thank you so much.
What name of the valve?
Safety release valve
Sounds like a bad brake chamber problem.
There are several possible contributors to this type of problem, and the video explains what some (but not all) of the possible causes are. It can also be caused by a bad trailer ABS/parking brake valve, bad S-Cams, bad S-Cam bushings, bad slack adjusters, etc. Brake chambers most often get replaced because of audible leaks - which won't have anything to do with this problem.