The Nissan Sentra Brake Booster amplifies the pressure that you apply to the brake pedal before it reaches the master cylinder of the brake system. In other words, the booster eases the physical effort needed to stop the car. Situated between the brake pedal and master cylinder, this Brake Booster fits within a two-piece shell inside the Nissan engine bay and operates by engine vacuum causing a pressure difference across an internal diaphragm and piston, easing everyday Sentra stops. Upon pressing the pedal, the driver's action engages a rod that activates a valve. This valve allows atmospheric air to enter the rear chamber of the power piston. Moreover, the front chamber of the power piston remains under vacuum. Therefore, due to this difference in pressure, the power piston moves forward. Furthermore, this increase in hydraulic pressure gets transferred to the master cylinder. When the pedal is not pressed, vacuum pressure equalizes on both sides of the brake, allowing it to disengage from the wheels. Once the engine stops, the Brake Booster only offers limited assistance as the vacuum is not available. Every Nissan compact in the Sentra lineup utilizes the same vacuum-operated Brake Booster design that reduces pedal effort. The Nissan brake system is equipped with a reliable Brake Booster, the sealing surfaces of which warrant regular inspection throughout the service life of the vehicle. Each Sentra can be counted on for a smooth and predictable stopping response.
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