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Originally Posted by eplurubus
Any ideas how to pressurize the air system of an '01 Mack using an outside source of air? Do I remove the air tank bleed valve and pump air in through there?
Yeah, get the proper size fitting to screw into where the bleed valve goes, and hook your hose onto it.
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Also, just today, I learned that trucks of old had starters turned by air pressure. Why is that system pretty much done away with today? It seems like a good way to save battery power, especially in the winter.
They were also a great way to not have your truck start, especially in the winter. The air systems on trucks are notorious for having moisture in them, and in the winter, that moisture becomes ice. Can't start a truck if the line is frozen. And also, can't start the truck if you develop an air leak that drains the system.