Thinking Ahead of Big Trucks
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One of the critical concepts I learned as a collision investigator this that fully loaded heavy trucks have 50 to 60% of the braking capability of light vehicles. This assumes that the braking system is not overheated, has been maintained properly and is correctly adjusted.
Air brake systems also suffer from brake lag, a short time period that occurs between the driver stepping on the brake pedal and the brakes starting to apply.