Sealco 110500 slow to set spring brakes

Well I can try that. But it isn't going to be today. I'm kind of tired of fussing with it. For now. I also am pretty sure it isn't coming from the service side. When I set the brakes the only air it is releasing is from what is in the air tank. Once it is empty that is it. The spring brakes are then set 100%. Also when it is doing that there isn't much air left in the tank. Because not much leaks, it is very slow. Then when that tank is empty that is it.

 

Yeah I could do this as well. I know it does the same thing this one does. All three have been on this trailer and done this. I just didn't realize it was the cause until this week when I actually dove into it to fix it. I never really cared before. It must be a trailer issue somewhere. But I can't find it. I flushed all the emergency side red lines earlier too to make sure they were good and clean.

 

Yeah nothing out of any blue lines anywhere. I pull the knob to set the trailer brakes. The valve exhausts like it should but it only sets the spring brakes about 75%. You can roll the tires if you pull hard enough with your truck. Then the remaining air in the trailer tank tries to drain out of the RED trailer gladhand. Once the trailer tank is completely empty from the back feeding air then the spring brakes are set 100%. Maybe I should try another valve?? It is just such a simple system. Even the valve is simple. So annoying that I can't get it working 100% correct.

 

Yes the tandems slide.

 

Nah the air bags don't dump. I think the only valve they have doing anything is the load level valve. It seems to work fine.