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How many over the road trucks and trailers weighing 80,000 lbs have disk brakes? I venture to say 5% at most. The reason you see disk brakes on automobiles is they work much better (more predictable) with anti-lock brakes and are less susceptible to water brake fade than drum brakes. Also, disk brakes work much better at temperatures above 800 degrees so the are used in racing. Other than those exceptions, well maintained drum brakes are as good, most times better and just as reliable. I have two vehicles with power, anti-lock disk brakes and a convertible and truck with manual, drum brakes. All four can lock up the brakes with moderate brake pressure (anti-lock off).
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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