There could be several reason for the slow release.
1) The quick release valve may not be working. Then the air will release slowly. Shut the engine off. The put it in gear so it will not roll. Then have some one work the treadle/foot valve. You should hear the quick release valve dump the air fast when the brakes are let off. You need to be back by the trailer because the truck's quick release will make enough noise that you can't hear if the trailer one is working or not.
2) You could have a mechanical problem. Sticking cam arms can cause a slow release issue too. I just had this on our Red River belt trailer. We installed complete new brake system. Cam arms, cam arm bearings, slack adjusters, new shoes and drums. So everything was brand new. The front axle would slow release. The brakes did not get hot but if you used the trailer brakes to hold yourself while being loaded they would release slow enought that you would not move on an incline.
They drove me nuts. I check all the air system out several times. I even switched the quick release valves off another trailer that worked fine. Still zero difference. I finally removed the drums and brakes. The cam arm moved stiff. It would move with just light pressure but the return springs would not make it return fast. The cam bearings are a plastic bushing in a tapered housing. When you would tighten the mounting bolts up all the way they would bind the cam arm. I put small washers between the housings. So you could tighten the mounting bolts. Everything worked fine after that. It cost me a set of brake shoes wearing out from slow release.
I also had one bind from being over greased. It had these oring type seals in the cam arms. If you greased it until you saw grease come out it would blow the orings out of the bushings. Then they would bind the cam arm.
3) Your truck's control valve maybe still holding low pressure too long on the trailer brake lines after you release the brakes. This will cause the trailer's quick release valve not to work. It has to have the control line pressure drop to zero before it will dump. Had one on the trucks do this last winter. You could still feel the brakes holding for a little while after you released the brake pedal. Made driving it on snow/ice difficult/dangerous. I had to replace the truck treadle valve. Make sure you are using the foot pedal when you check the quick release valve on the trailer. The hand valve may work and the treadle/foot valve not.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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