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2. 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.

3. 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 ...

4. 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).

5. Federal Motor Vehicle Safety Standard 116 - Wikipedia

   en.wikipedia.org/wiki/Federal_Motor_Vehicle...

   This standard specifies requirements for fluids for use in hydraulic brake systems of motor vehicles, containers for these fluids, and labeling of the containers. The purpose is to reduce failures in hydraulic braking systems of motor vehicles which may occur because of the manufacture or use of improper or contaminated fluid.

6. Retarder (mechanical engineering) - Wikipedia

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

   Exhaust brakes are simpler in operation than an engine brake.Essentially, the exhaust pipe of the vehicle is restricted by a valve.This raises the pressure in the exhaust system, forcing the engine to work harder on the exhaust stroke of its cylinders, so again the engine is acting as an air compressor, with the power required to compress the air being withheld from the exhaust pipe, retarding ...

7. Driver's licences in Canada - Wikipedia

   en.wikipedia.org/wiki/Driver's_licences_in_Canada

   Air brakes: Air brake endorsements are required for any driver of a vehicle with an air-only braking system or a combination air and hydraulic braking system. [6] Any driver in Alberta may obtain an air brake endorsement after completing an approved air brake course, which includes a practical exam, and writing the written knowledge test at the ...