air-brake
A train engineer applies the air-brake as the locomotive approaches a station.
Definition
- Noun:
- A brake that is operated by compressed air: An "air-brake" is a braking system that uses compressed air to apply force to brake pads or shoes, commonly used on heavy vehicles such as trucks, buses, and trains.
- A system for slowing or stopping motion: Specifically, it refers to any device that uses air pressure to create friction or resistance to decelerate a moving object.
Usage Examples
- Noun:
- The truck driver tested the air-brake before descending the steep hill. (The compressed-air braking system was checked for safety.)
- Modern trains rely on air-brakes for reliable stopping power. (The braking mechanism uses compressed air.)
Advanced Usage
"to apply the air-brake": to engage or activate the compressed-air braking system.
- The engineer applied the air-brake gradually to avoid jerking the train. (The compressed-air brake was used smoothly.)
"air-brake failure": a malfunction in the compressed-air system that prevents proper braking.
- Air-brake failure can be catastrophic on long downhill grades. (A loss of air pressure stops the brakes from working.)
Variants and Related Words
Air-braking (n): the act or process of using an air-brake.
- Air-braking is standard on heavy commercial vehicles. (The use of compressed-air brakes is normal.)
Air-brake system (n): the entire assembly of components (compressor, reservoirs, valves, lines, and actuators) that operates the brake.
- The air-brake system requires regular maintenance to prevent leaks. (The whole compressed-air braking assembly.)
Synonyms
- Compressed-air brake: a brake powered by compressed air.
- Pneumatic brake: a brake that uses air pressure (pneumatic refers to air).
Related Idioms
"Hit the air-brake": (informal) to suddenly apply the air-brake, often for an emergency stop.
- The driver had to hit the air-brake to avoid a collision. (Suddenly engage the compressed-air brake.)
"Air-brake hiss": the sound of compressed air escaping when the brake is applied or released.
- The loud air-brake hiss signaled the bus coming to a stop. (The characteristic sound of the pneumatic system.)