Contents hide 1 2022 Subaru Outback Brake Booster 2 Brake Booster 2022 Subaru Outback Brake Booster Brake Booster The brake booster utilizes the vacuum produced by the engine manifold to reduce the force required to depress the brake pedal. The vacuum in the brake booster may be insufficient if the brake pedal is depressed when … Continue reading 2022 Subaru Outback Brake Booster User Manual