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08
2025-05
The difference between brakes and engines
Brake systems, such as service brakes, use mechanical friction to directly brake the wheels
Wheel brakes (such as service brakes) directly brake the wheels through mechanical friction, while engine braking uses engine internal resistance to decelerate. The two differ fundamentally in their working principles, operation, and usage scenarios.
Specific differences are as follows:
I. Different Working Principles
Brakes (usually referring to service brakes, i.e., foot brakes):
Operated via the brake pedal, they use a hydraulic or pneumatic system to apply friction to the wheel brake disc/drum, generating braking force.
For example, when the brake pedal is pressed, the brake pads rub against the brake disc, quickly reducing speed until the vehicle stops.
Engine braking:
After releasing the accelerator pedal, the resistance generated by the engine's compression stroke, intake and exhaust resistance, and internal friction are used to slow down the drive wheel speed.
For example, when going downhill, shifting to a lower gear without pressing the accelerator pedal limits the engine speed, causing the vehicle to decelerate.
II. Different Usage Scenarios
Brakes are suitable for all situations requiring deceleration or emergency stops, such as red lights and avoiding obstacles.
Engine braking is often used on long downhill slopes and slippery roads to help control speed and reduce brake pad overheating and wear.
III. Different Operating Methods
Brakes require actively pressing the brake pedal to apply braking force.
Engine braking only requires releasing the accelerator pedal and controlling the deceleration intensity through gear selection (e.g., lower gears in manual transmissions).
IV. Differences in Effect
Brakes (foot brakes) provide strong and direct braking force, capable of significantly reducing speed in a short time.
Engine braking is relatively gentle, with a smoother deceleration process, primarily serving as an auxiliary method.
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