- The vacuum hose is a hose that connects the intake manifold to the vacuum brake booster system in some automobiles. The hose is used in cars that use a vacuum system instead of a hydraulic braking system.
- The engine creates a vacuum inside the vacuum hose when the atmospheric pressure outside the hose is made less than the pressure inside, allowing the brake booster system to operate.
- The hose is connected between the master cylinder and the vacuum brake booster, which is mounted on the engine. Through the vacuum created by the engine, the hose produces extra braking power.