Your rotors may be out of balance. When my 2001 Silverado was not only 3 months off of the dealers lot I had this same problem that persisted for sometime. The dealer finally realized the problem and changed out both front rotors.
top of brake pedal
Think it's on the brake pedal close to the top
The signal light flasher on a 1992 Chevy Silverado is under the dash. It is on the driver's side just above the brake pedal.
It is located on the brake pedal arm under the dash.
Pull the release handle for the e brake and then while its pulled out pull up on the pedal
Check the brake light switch. It should be mounted on the upper part of the brake pedal or the brake pedal frame. If the brake lights go off when you unplug it you have a stuck or shorted switch.
Get some speed up, then brake hard. If you feel the brake pedal pulsating you have ABS:
most likely a clog in the line or wheel cylinder or maybe a broke spring
Bad stop light switch? Located at the upper end of the brake pedal under dash area
The wire you are looking for is a white wire in the bundle that is closest to the brake pedal. Use a test light or meter to check voltage going through the wire when the pedal is pressed.
Check the bulbs,if not the bulbs you most likely have a bad ground.
The fuse controls for the cargo light on a 2001 Chevy Silverado are located in the fuse panel just beside the brake pedal. It is labeled on the cover and can be replaced by the owner.