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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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