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.
- beseech
- beseecher
- beseechingly
- be seeing double
- be seeing things
- beseem
- beset
- be set fair
- be set in concrete
- besetting sin
- be shitting bricks
- beshrew
- be sick
- beside
- beside oneself
- beside (or off) the point
- besides
- beside the point
- besiege
- besiegement
- besieger
- be simplicity itself
- be sitting pretty
- be skin and bone
- besmear