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You take your foot off the brake pedal.
Two filaments in the light bulb. One is the tail light, the other is the brake light.
OPEN THE TRUNK AND AND FIND WHERE THE LIGHTS SEAT UP TOWARD THE TRUNK THERE SHOULD BE SOME WIRING THERE, THAT UNSCREWS FROM THE LIGHT ASSEMBLY.
Changing the brake light relay switch on your 1999 Chevy Cavalier is quite easy. The brake light switch simply plugs in and out.
separate
To change the brake light bulb on a 1999 Honda Passport find the light housing located in the trunk. Find the plastic covers for the lights and remove them. Pull the bulbs out carefully and replace them.
Wal mart, any auto store. They are everywhere.
how to replace brake fluid on a 1999 Toyota 4runner
how to change the brake light in a Nissan frontier 1999
In order to change the brake light, check your manual for directions. You will need to remove the cover and replace the burnt out bulb.
Light is usually comes on, when there is a problem with pressure in brake lines. Inspect the brake fluid level, and check for leaks.
I believe you need 17 mm box wrench for that.