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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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