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2. Driver's licenses in the United States - Wikipedia

   en.wikipedia.org/wiki/Driver's_licenses_in_the...

   This restriction is issued when a driver either fails the air brake component of the general knowledge test or performs the CDL road skills test in a vehicle not equipped with air brakes. M: CDL-A holders may operate CDL-B school buses only. N: CDL-A and CDL-B holders may operate CDL-C school buses only. O: Driver limited to pintle hook ...

3. Commercial driver's license - Wikipedia

   en.wikipedia.org/wiki/Commercial_driver's_license

   A commercial driver's license is required to operate a tractor-trailer for commercial use. A commercial driver's license (CDL) is a driver's license required in the United States to operate large and heavy vehicles (including trucks, buses, and trailers) or a vehicle of any size that transports hazardous materials or more than 15 passengers (including the driver).

4. Anti-lock braking system - Wikipedia

   en.wikipedia.org/wiki/Anti-lock_braking_system

   Symbol for ABS. ABS brakes on a BMW motorcycle. An anti-lock braking system (ABS) is a safety anti- skid braking system used on aircraft and on land vehicles, such as cars, motorcycles, trucks, and buses. [1] ABS operates by preventing the wheels from locking up during braking, thereby maintaining tractive contact with the road surface and ...

5. Air brake (road vehicle) - Wikipedia

   en.wikipedia.org/wiki/Air_brake_(road_vehicle)

   Truck air-actuated disc brake. An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to both release the parking/emergency brakes in order to move the vehicle, and also to apply pressure to the brake pads or brake shoes to slow and stop the vehicle.

6. Retarder (mechanical engineering) - Wikipedia

   en.wikipedia.org/wiki/Retarder_(mechanical...

   Retarder (mechanical engineering) Torque converter, opened, interior similar to a retarder. A retarder is a device used to augment or replace some of the functions of primary friction -based braking systems, usually on heavy vehicles. Retarders serve to slow vehicles, or maintain a steady speed while traveling down a hill, and help prevent the ...

7. S-cam - Wikipedia

   en.wikipedia.org/wiki/S-cam

   An S-cam is part of a braking system used in heavy vehicles such as trucks and wheeled machinery. It consists of a shaft, usually around 4 to 25 inches long, turned at one end by means of an air-powered brake booster and lever with an S-shaped cam at the wheel end. Turning the shaft pushes the brake shoes against the drum, producing friction.