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2. Vacuum brake - Wikipedia

   en.wikipedia.org/wiki/Vacuum_brake

   Vacuum brake cylinder in running position: the vacuum is the same above and below the piston Air at atmospheric pressure from the train pipe is admitted below the piston, which is forced up. In its simplest form, the automatic vacuum brake consists of a continuous pipe—the train pipe—running throughout the length of the train.

3. Vacuum pump - Wikipedia

   en.wikipedia.org/wiki/Vacuum_pump

   A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a ... vacuum servo booster for the hydraulic brakes, ...

4. Hydraulic brake - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_brake

   The vacuum booster or vacuum servo is used in most modern hydraulic brake systems which contain four wheels, the vacuum booster is attached between the master cylinder and the brake pedal and multiplies the braking force applied by the driver.

5. Railway air brake - Wikipedia

   en.wikipedia.org/wiki/Railway_air_brake

   The main competitor to the air brake is the vacuum brake, which operates on negative pressure. The vacuum brake is a little simpler than the air brake. Instead of an air compressor, steam engines have an ejector with no moving parts, and diesel or electric locomotives have a mechanical or electrical "exhauster".

6. Vacuum servo - Wikipedia

   en.wikipedia.org/wiki/Vacuum_servo

   A vacuum servo is a component used on motor vehicles in their braking system, to provide assistance to the driver by decreasing the braking effort. In the US it is commonly called a brake booster . A vacuum servo, also known as a power booster or power brake unit, uses a vacuum, usually supplied by the engine, to multiply the driver's pedal ...

7. Power brakes - Wikipedia

   en.wikipedia.org/wiki/Power_brakes

   Vacuum boosters provide brake assist for the driver by multiplying the force out of the booster creating more than the force that was used to push on the brake pedal. The booster works by pulling the air out of the booster chamber with a pump or other vacuum source (typically the engine's intake manifold [1]), creating a low-pressure system ...