The sensor everyone is speaking of is mounted in the proportioning valve mounted on the frame below the master cylinder. This valve monitors the correct pressure between the higher pressure front disc brakes and the lower pressure rear drum brakes. Usually if the light is on due to a pressure problem it's because of a blown brake line which is more than likely on a truck of that vintage (rusted). All the lines should be replaced on the truck for the least amount of headaches (the ones that don't leak will, once you disturb them changing the one that blew). Once the system is in good order and the brakes bled correctly the valve re-centers and the light goes out. If the parking brake (same light) is at fault it's likely a stuck parking brake cable due to crud and rust. How's you gas mileage?
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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