The story of the show. Appointment
With the rise in the speed of cars in the mid-twentieth century and the increasing spread of disc brakes, the question was gradually how to stop the undispersed speed of the vehicle without being a weightlifter. The fact is that the effort that was necessary to force the brake pads to the brake disc increased directly in proportion to the speed that the car developed, not to mention how much of that time the vehicle had been paddle. Imagine the power you had to have to stop a few square centimeters, almost three tons of a car. The effort was transferred from the pedal to the brake directly-almost on the bicycle principle. And if the design of the drum brakes itself compensated for it, the disc brakes have nothing to do with it. Thus, the invention of artificial amplifier was an important task of engineers.
For the first time, the vacuum amplifier of serial has started to be installed even in 1928 by the car of the Pierce-Arrow brand. But up to the 1960's, such a device remained exclusively the domain of prestigious and expensive brands such as Lincoln, Cadillac, Duesenberg and Mercedes-Benz. The mere mortals in the old-fashioned way were packed on the pedal for a long time.
Device
The amplifier (diaphragm) is divided into two cells. The first of these, which is closer to the main brake cylinder, is called a vacuum, the opposite is atmospheric. The vacuum chamber is generally connected to a vacuum-operated electrical pump which lowes the pressure in the chamber by lowering the pressure from it. The atmospheric chamber is separated from the vacuum side, in addition to the special valve, as well as a special monitoring valve. In the initial position, the valve does not separate the compartments, but when the brake is pedal, the link between the two stops and the valve is blocked from one to the other. The movement of the valve is the responsibility of the pushrod.
What does the vacuum booster help the driver? Oddly enough, at the expense of the air. I mean, by his discharge. The pressure differential in the vacuum and atmospheric chambers gives an additional force to the piston of the main brake cylinder, proportional to the brake pedal force. Where does the thin air come from? In general, from the engine intake manifold, from where it is injected into the vacuum chamber by means of an electric pump. This technology allows the initial brake application force to increase 3 to 5 times. With the increase in the number of vacuum amplifier cameras, it is possible to increase this number.
