Originally Posted by
twodownzero
Many semi trucks still use large drum brakes. They don't shed heat as well as discs and are more complicated to replace, but drum brakes work just fine when they are installed and adjusted correctly. And they are superior when used as a parking brake because of their friction area. Who told you drum brakes were "inferior"? I'm sorry to say, that person is wrong. My 30 year old truck can lock its rear wheels if I'm not careful.
semi trucks still use large drum brakes because they are costly to upgrade.
they are ubiquitous in europe. who says drum brakes are inferior? the national highway traffic safety board.
https://www.nhtsa.gov/sites/nhtsa.do...oths809700.pdf
Class 8 Truck Tractor
Braking Performance Improvement Study
Four configurations of pneumatic foundation brakes were evaluated and compared for high-speed stopping
performance on two Class-8 6x4 truck tractors.