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Blair makes some valid points. Air brakes are used only on the heaviest of trucks. Trucks that had air brakes regularly even only 10 years ago now have hydraulic brakes which shows how far braking systems have come in the last few years. But once you start hitting the 30000 pound class you only see air. Hydraulics get limited by size and number of brakes. Air can go to any size and number of axles. Also trying to stop a loaded truck with an manual e-brake is a pretty iffy thing but if the e-brake comes on in air brakes the wheels are locked and all axles but the steering axle will be locked. Air brakes have also come a long way in the last few years with automatic adjusters and disk brake systems.
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Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Nacho's in the other - body thoroughly used up, totally worn out and screaming : Woo Hoo, what a ride!
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