replace the front brakes and rotors
A problem has been detected with the Anti-lock Brake System : It could be a fuse , a sensor , or some other problem As long as the red " BRAKE " light in your dash is not on , you still have " normal " brakes
It means that the computer has detected a problem and has stored a trouble code in it. You must have the code scanned in order to tell what the problem is. If you do not have a code scanner then an automotive shop will be able to help you diagnose the code.
Check the catlytic converter for blockage
Front hubs my be wearing out.
Bent blades or loose mounting. my problem was that it I dont use Trailblazer often and , all sudden fan blower started vibrate, took it to the dealership and "oh my god" it was ACORNS, how the hell did acorns get in? rodents! they can carry and slip though 1/2 inch holes that in the Trailblazer designs.
A/C compressor not running
There are several things that can cause your 2004 Chevrolet Trailblazer to idle rough. The most common causes are a dirty fuel filter or a dirty air filter.
Your 2003 Chevrolet trailblazer radio probably cut though because of a loose or corroded ground wire. The positive wire may also be loose.
sticking thermostat, fan clutch or waterpump. all have tell tale signs.
I think that's where the spare tire is kept, that where mine was.
Possibly just an adjustment on the rockers. Hydraulic system. Hopefully that's it.
CAM Actuator screens need to be cleaned or replace whole part.