Couple kinds of air brakes, one kind uses compressed air at maybe 25/40 pounds pressure to engage large drum brake shoes with large cylinders. Next kind is Simplex shoes in drum with spring engagement- the air at 40/60 pound in cylinder diengages the brake shoes- release air pressure and the brakes engage, this is common on some large over the road trailers and has the safety feature of air line failure-like from accidental disconnect from tow vehicle- means brakes engage. A 12 volt low volume pump charging a small air tank for a pressure on engage would be relatively simple to rig with a battery on trailer and maybe a simple relief pressure solenoid- the low pressure engage with a 2 minute leakdown bleed from air cylinder would mean engage brakes to slow down/stop and couple minutes later brakes are free again- if you want to move earlier the relief valve vents enough to release brakes. this means trailer can be pulled without brakes if no air pressure like around yard and charge engagement tank when needed on road. The other type means no air=no move unless manual back off of brake adjuster. Ask a tow truck driver how bad that is for a semi trailer that got disconnected at side of road when towing vehicle broke down and had to be towed seperate, no relief tow available in time to remove trailer in winter. RN.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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