The Mechanic Inc.

It's simple enough to test your brake lights. Just have another person stand behind the car while you step on the brake pedal and have him or her tell you if everything looks OK. If you're working alone, rig up a mirror or lay a broomstick on the pedal and tuck it into the seat, then walk behind the car and look for yourself. (Obviously, the car needs to be in "park" when you do this.) Cars built in recent years feature three brake lights - one on either side in the rear, both of which are implanted in the rear bumper, and a center light in the trunk or back window.