Brake light issue on 1998 GMC 2500 Pickup

The brake lights work correctly when light pressure is applied to the pedal, but then goes out when more pressure is applied. We've checked the fuses, bulbs, and replaced the brake light switch and relay. What else could cause this issue?

by in Beaver Dam, KY on September 09, 2012
2 answers 2 comments
ANSWER by on September 09, 2012
98 chevys were bad for rear sockets rotting out take the taillight assembly out and check for rust gm came out with an upgrade that are made of plastic to prevent corosion
COMMENT by on September 10, 2012
Thanks for the help guys. As it turns out it was a combination of two things. There was a shorted out wire AND the brake light switch that we had replaced was bad. We repaired the wire, and got another switch. Thankfully it's working perfectly. I never would have thought that a brand new switch would be bad. What are the odds of that?
ANSWER by on September 09, 2012
turn on the headlights and flashers aat the same time and if there working the way there supose to the you need to replace the sencer that the pedel hites to ingage the lights just under the dash behind the pedel.
COMMENT by on September 10, 2012
Thanks for the help guys. As it turns out it was a combination of two things. There was a shorted out wire AND the brake light switch that we had replaced was bad. We repaired the wire, and got another switch. Thankfully it's working perfectly. I never would have thought that a brand new switch would be bad. What are the odds of that?