🎯 주제별 연습
Air Brake System Parts
The parts of an air brake system and how they work: air compressor, governor, air tanks and drains, alcohol evaporator, safety valve, brake pedal, foundation brakes (s-cam, wedge, disc), supply and application pressure gauges, low air pressure warning, stop light switch, front brake limiting valve, spring brakes, parking brake controls, and ABS.
Dual Air Brake Systems
Dual air brake systems: two separate air brake systems (primary and secondary) operated by one set of controls, each with its own tanks and lines; building pressure before driving, the low-air-pressure warning, and what happens when one system fails.
Inspecting Air Brakes
The air-brake-specific parts of the seven-step inspection: checking the air compressor belt and slack adjusters, brake drums, linings and hoses, and the Step 7 final air brake check — low-air warning, spring-brake auto-apply, pressure build-up rate, static air-leakage-rate test, governor cut-in/cut-out, and parking- and service-brake tests.
Using Air Brakes
Using air brakes in normal and emergency driving: smooth normal stops, brake lag / air lag (~½ second), total stopping distance with brake-lag added, controlled and stab braking, emergency stops, responding to a low-air-pressure warning, and proper parking-brake use.
Antilock Braking Systems (ABS)
Antilock braking systems (ABS) on air-brake vehicles: what ABS is, the yellow malfunction lamps on tractors/trucks/buses and on trailers, how to tell if a vehicle is equipped, and how to brake correctly — ABS is an addition to your normal brakes, so brake normally and don't pump.
Downhill Braking & Brake Fade
Braking on long, steep downgrades and brake fade: what causes fade (excessive heat from overusing the service brakes instead of engine braking), how brakes overheat and lose friction, why a safe speed and low gear must be selected before the grade, and the proper snub-braking technique down a long downgrade.