brake light 
noun
A red light at the back of a vehicle that is automatically illuminated when the brakes are applied.The entire light cluster can be a rear light, a brake light or an indicator, and automatically adjusts in intensity and brightness to suit prevailing conditions....
- The re-engineered boot lid features a centrally-mounted brake light and reversing lamp.
- He noted a leaking shock absorber, a broken exhaust front pipe bracket, a broken rear light, a broken rear brake light and a ripped windscreen wiper.
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