Jim in MN is right on. You have a distribution block on the drivers inside frame rail that works in conjunction with the master cylinder and the ABS system. GM has had problems with the distribution block for years. If you climb under the truck, there will be an electrical connector going to the distro-block. Disconnecting the sensor will stop the pulsing and back feed into the pedal. Disconnecting it won't affect the brakes, it only eliminates the ABS input, meaning you won't have anti-lock brakes. You can replace the block for around 1700, but be careful if you have rust build up on the lines going into the block. The lines tend to twist and break if very rusted. Don't waste your money on the remanufactured distribution blocks because you'll be doing the job over again in a few months. I have had good luck with ones from the junk yard if you can find them. They can be hard to find sometimes. Junk yard part is about half price, still kind of spendy. Good Luck
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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