Start Up: The hydraulic brake system

[Music] here it's no problem at all to slow down a vehicle using only leg power in modern vehicles however pure muscle power would not suffice here the driver is supported by the vehicle's brake system with brakes at the front and rear axles pressing the brake pedal slows down the vehicle the vehicle's brake system employs Hydraulics this means that a force is transmitted via a liquid the principle is based on a closed system with pistons cylinders and a special liquid but how does it work liquids have one very special physical characteristic they're incompressible unlike air that's why hydraulic systems must be free of air within a hydraulic system pressure is exerted on a liquid by means of this Force the space within a cylinder is reduced and the liquid is displaced the resulting pressure acts the same at any point in the system retaining its magnitude if two cylinders of equal size are connected to each other the liquid transmits the exerted Force while maintaining the ratio what does that mean for a vehicle the foot exerts a force on the brake pedal it sets the brake fluid within the brake master cylinder in motion the fluid is forced through the connected tubing to the wheel brake cylinder the exerted force is thus transmitted this principle Remains the Same even if more than one wheel Brak cylinder is connected the force continues to be transmitted uniformly however it's divided into four equal parts proportionally reducing the distance moved by the Pistons in a vehicle this is called a single circuit brake system for increased safety the system is separated into two circuits depending on the vehicle concept the brake system acts separately on the front and rear axles or in a diagonal Direction This provides increased safety in case one brake circuit should fail a hydraulic system not only transmits forces it also multiplies them for this to happen the operating Piston's diameter must be smaller than that of the working piston it's the same in a vehicle the diameter of the brake master cylinder is smaller than that of the wheel Brak cylinder the force exerted by by the brake pedal is thus not only transmitted but also multiplied the brake system works with a special liquid to ensure reliable operation it has to meet certain requirements it should operate equally well at low temperatures as at very high temperatures even when the brakes themselves are operating under extreme heat that's why the brake fluid must be exchanged regularly the fluid is transported via steel pipes and Brake hoses from the brake master cylinder to the wheel brakes for the rear axle brakes the pipes are guided along the underbody brake hoses are used in movable areas additional components like the brake Servo allow for comfortable brake operation and systems such as the anti-lock brake system further improve driver comfort and safety

Channel: Learning Services Technical

Views: 821,849

Keywords: Volkswagen Passenger Cars (Automobile Company)

Id: _imyybhZV80

Length: 5min 34sec (334 seconds)

Published: Fri Aug 08 2014