How does a brake booster work?
How does a brake booster work?
A brake booster amplifies the force you apply to the brake pedal, making it easier to stop your vehicle. It does this by using a vacuum created by the engine to multiply the pressure you exert on the brake pedal, which then pushes fluid into the brake calipers or wheel cylinders, applying the brakes.
- ۱٫ Engine Vacuum:The brake booster relies on a vacuum created by the engine’s intake manifold. This vacuum is typically maintained by a one-way valve that keeps a constant vacuum on one side of the booster’s diaphragm.
- ۲٫ Brake Pedal Input:When you press the brake pedal, a rod connected to the pedal pushes a valve inside the booster.
- ۳٫ Pressure Differential:This valve opens, allowing air to flow into the booster on one side of a diaphragm, while the other side remains at a vacuum. This creates a pressure difference across the diaphragm.
- ۴٫ Diaphragm Movement:The higher pressure on one side of the diaphragm pushes it, and this movement is mechanically linked to the master cylinder.
- ۵٫ Master Cylinder Activation:The movement of the diaphragm pushes the master cylinder’s piston, which then forces brake fluid through the brake lines to the calipers or wheel cylinders, applying the brakes.
- ۶٫ Power Braking:The brake booster significantly amplifies the force from your foot, making it much easier to stop the car, especially with disc brakes, which require higher clamping force.
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