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Originally Posted by JSH
Friction brakes vs compression braking isn't much of a concern today for on-highway trucks as the vast majority of them have computer controlled manual transmissions. The computer will match RPM to speed and automatically downshift as needed.
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AMTs are quite widespread on the heaviest side of the medium-duty truck market in Brazil, and more recently it's becoming more common on Class 5 too, as a cheaper alternative to a conventional AT which is still considered expensive and hard to mantain by most fleet managers.
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It is the vocational side of things that we still see drum brakes - and manual transmissions.
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Drum brakes are quite widespread here, and so are manual transmission too, yet AMTs are taking much of its market share on vocational applications, as long as a PTO is not needed. Otherwise the best option for vocational trucks is a real automatic. I don't remember seeing many AMTs with a PTO.