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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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