What is the primary purpose of a brake booster?

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The brake booster provides power assist to braking, using engine vacuum to multiply the driver’s pedal effort so you can apply the brakes with less physical effort. It sits between the brake pedal and the master cylinder and uses a diaphragm that creates a vacuum-assisted force that adds to what you push, increasing the braking force delivered by the hydraulic system. This makes stopping easier, especially at low speeds or in emergency stops, without needing to push harder on the pedal. It does not increase engine power, it does not eliminate the need for brake fluid, and while it may slightly affect pedal travel, the main purpose is reducing the effort required to achieve effective braking.