Here's a step by step
http://forums.trailvoy.com/showthread.php?t=59485
Trailblazer enthusiasts will cover all the subjects including brake jobs at www.trailvoy.com
WHICH brake light?
Yes.
Change the ignition switch. About 40$ and 30 mins of your time. Had it happen on several Trailblazers and envoys.
All vehicles have brake pads.mine has disk brakes and the pads take about 10 minutes a piece to change.
how to change the rear tail light bulb on a 2004 Nissan maxima
How to change the brake switch on a 2004 Jeep grand Cherokee Laredo
Change the brake pads sensors. You must change them after every brake pad swap.
remove and replace engine coolant temperature(ect)/chevy 2004 trailblazer
AnswerIgnition on - engine off - floor the gas pedal 3 times. That's it!
see "how too replace water pump on 2002 Trailblazer"
Seeing as your not that savvy.. take it to a 'lube shop let them change your oil