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What is the working principle of air brakes?

3 Answers

VonBeckett

07/29/25 10:13am

Air brakes work by pressing the brake pedal, which allows compressed air to enter the front brake cylinder and rear brake spring cylinder through a one-way valve. This action pushes the brake arm, causing the brake cam to rotate and expand the brake shoes to tightly contact the brake drum, achieving the braking effect. Below are specific details about air brakes: 1. Components: The air brake system consists of a brake control mechanism, dual-circuit brake mechanism, central disc brake mechanism, brake, and air compressor, among others. 2. Air brake technique: Vehicles with air brakes require at least 3 bars of pressure to move, ensuring effective braking performance.

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McVanessa

08/13/25 1:24pm

I remember when studying heavy vehicle braking systems, the core of air brakes is using compressed air to achieve braking force. The engine operation drives the air compressor to work, compressing air into the storage tank. When the brake pedal is pressed, the valve opens to release air pressure, and this airflow is transmitted through pipelines to the brake chamber, pushing the piston to press the brake pads against the wheels, achieving the braking effect. Why do trucks and buses use this system? Because hydraulic brakes are prone to overheating and failure during prolonged downhill driving or heavy loads, while air dissipates heat quickly, making it more stable and reliable. For daily maintenance, it's important to check if the air pressure gauge is functioning properly. Air leaks are minor issues, but they should be repaired promptly to avoid affecting safety.

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AlexMarie

10/07/25 3:38am

I've been driving trucks for over a decade, and air brakes are as reliable as an old friend. The principle is using compressed air to control braking, unlike passenger cars that use hydraulic fluid. While the engine runs, the compressor fills air tanks, and pressing the brake pedal instantly releases air pressure to activate the braking mechanism. Honestly, air leaks are my biggest concern - I check the air pressure warning light every morning to ensure it's within normal operating range. On long downhill stretches, air brakes offer superior heat dissipation, consistent braking force, and higher safety margins. Maintenance is straightforward, just regularly cleaning contaminants from the air lines.

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