Dodge Charger Power Brake Booster

How a Power Brake Booster Works in a 2019-2023 Dodge Charger

A power brake booster uses engine vacuum to multiply the force you apply to the brake pedal. This makes braking feel lighter and helps you stop more smoothly.

Key components you’ll find in the Charger’s brake system

- A tandem-diaphragm brake booster, which is a self-contained vacuum-powered unit. It uses two diaphragms to provide boost and does not need a separate vacuum reservoir. ([chrysler300clubinc.com](https://www.chrysler300clubinc.com/jholst/62-service-manual/service-brakes.pdf))

- A one-way vacuum check valve that keeps vacuum in the booster when the engine is turned off or vacuum leaks occur.

- An intake-manifold vacuum hose supplying the booster with engine vacuum. ([chrysler300clubinc.com](https://www.chrysler300clubinc.com/jholst/62-service-manual/service-brakes.pdf))

- A push rod connected to the brake pedal, which links the booster to the master cylinder. ([auto.howstuffworks.com](https://auto.howstuffworks.com/auto-parts/brakes/brake-types/power-brake.htm))

- The hydraulic master cylinder, which converts brake fluid pressure into braking force at the wheels. ([chrysler300clubinc.com](https://www.chrysler300clubinc.com/jholst/62-service-manual/service-brakes.pdf))

How the Charger’s booster operates, step by step

- The engine’s vacuum creates a partial vacuum inside the booster on both sides of the diaphragm, while the atmospheric side is at ambient pressure. ([auto.howstuffworks.com](https://auto.howstuffworks.com/auto-parts/brakes/brake-types/power-brake.htm))

- When you press the brake pedal, the booster’s control valve opens, allowing atmospheric air to enter one side of the diaphragm while the other side stays under vacuum. This pressure difference pushes the push rod and helps move the master cylinder piston. ([auto.howstuffworks.com](https://auto.howstuffworks.com/auto-parts/brakes/brake-types/power-brake.htm))

- The result is a larger hydraulic force at the master cylinder than you could generate with your foot alone. The system uses the tandem diaphragms to provide more boost, especially under high braking demand. ([chrysler300clubinc.com](https://www.chrysler300clubinc.com/jholst/62-service-manual/service-brakes.pdf))

- As you release the pedal, the valve closes and vacuum is restored to both sides of the diaphragm, returning the booster to its idle state.

You can find a factory original OEM replacement brake booster here.