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Duplex brake gauge on a British electric multiple unit. Left needle shows air supplied by the main reservoir pipe, right needle shows brake cylinder pressure. Another solution to loss of brake pressure is the two-pipe system, fitted on most locomotive-hauled passenger stock and many freight wagons.
Later models have a small turbine-powered electrical generator using air pressure from the brake line to power the ETD's radio and sensors. The one-way communication of brake data from the ETD to the locomotive evolved into two-way communication that enables the engineer to apply the brakes from both ends of the train simultaneously in an ...
a brake cylinder on each vehicle containing a piston, connected by rigging to the brake shoes on the vehicle; and; a vacuum (pressure) gauge on the locomotive to indicate to the driver the degree of vacuum in the train pipe. The brake cylinder is contained in a larger housing—this gives a reserve of vacuum as the piston operates.
Truck air-actuated disc brake. An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to both release the parking/emergency brakes in order to move the vehicle, and also to apply pressure to the brake pads or brake shoes to slow and stop the vehicle.
Driver's duplex air brake gauge: The left needle shows the pressure of the main reservoir pipe supplying the train, the right that of the brake cylinder, in bar. In the early part of the 20th century, many British railways employed vacuum brakes rather than the railway air brakes used in much of the rest of the world.
The fault could be lack of hydraulic fluid, low brake fluid in the reservoir, a broken hydraulic line or a bad master brake cylinder. The sensor is used to detect pressure differentials in the hydraulic system. If the car alerts a fault in the hydraulic system and the system checks out, the sensor itself may have failed. [2]
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