The Volvo 940 Brake Booster enables the driver to use less leg muscles to slow down, as the force on the pedal is amplified before it reaches the master cylinder. The Brake Booster, which is placed between the brake pedal and the hydraulic master cylinder, utilizes vacuum or a hydraulic assist system to increase the force applied to the brakes. The majority of Volvo vehicles of this period are based on a vacuum design in which engine vacuum is fed to a closed chamber that houses a flexible diaphragm and a power piston. For Volvo drivers, the vacuum on both sides of the chamber prevents the piston from moving when the pedal is stationary. By pressing the pedal, an internal valve opens, allowing atmospheric air to rush into the rear half, establishing a difference in pressure that propels the piston forward and gives the master cylinder much greater force than the driver alone could provide. In subsequent 940 models, a hydraulic Brake Booster can instead draw pressurized fluid from either the steering pump or a single electric pump, reaching the same result without the need to use engine vacuum. Such support gives Volvo owners confidence even in sudden stops. In either style, both boosters provide the benefit of powerful and consistent braking without increasing the effort needed at the pedal, although they can only help for a few stops if the engine or pump fails. Vacuum boosters are regarded as very reliable, but they can still fail, mostly due to internal diaphragm leaks or valve issues, which deprive the system of the pressure difference.
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