brake light

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brake light

a red light attached to the rear of a motor vehicle that lights up when the brakes are applied, serving as a warning to following drivers
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Brake Light

 

a light signal on a motor vehicle, trolley car, or similar vehicle that warns the drivers behind that the vehicle is braking. One brake light is situated at each side of the motor vehicle and is usually integrated with the taillights; the two lights are connected by a switch with the brake system’s pneumatic or hydraulic circuit. When the brake pedal is pressed, the diaphragm of the brake switch bends under the pressure of compressed air or brake fluid and closes a pair of contacts, thus switching on the brake lights. Brake lights are equipped with red diffusing lenses. The light intensity in the direction of the optical axis should be not less than 40 international candles. Brake lights with dual intensity modes for daytime and night driving are also produced.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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