My '03 trailblazer has begun having some issues. I know the back pads are toast and I assume that's why it grinds to a stop. What I don't know is if that's the only thing making it do it. When I come to a stop it grinds hard and when the truck is almost stopped it grinds hard to the point that it feels like the truck is dying. Also it doesn't want to release when I start driving again. It's like something is staying engaged. When I speed up and slow down it makes a noise like I'm driving to fast in 4WD but when I switch between 2hi, 4awd & 4hi it makes the whining sound like it disengaged. 4lo makes the clunk it's supposed to. Help??
If your brake pads are "shot" you are now facing the need to also replace your rear drums/rotors. It feels like your brakes are still engaged because your once brake pads are only metal backing pads that are gouging your drums/rotors. Your wheel cylinders may be causing the sticking feeling as well from residual brake dust and the boots hyperextending from not having ample brake pads.
If the rear brake pads are worn out, it will give you a grinding noise. If the pads and rotors get too low, this cause the caliper piston to pop out (the caliper pushes the pads against the rotor so the vehicle will stop). If the piston pops out or gets stuck, it can cause the brakes to feel like they are locked up. This needs to be fixed ASAP, as it is a safety issue.
While to 4WD system will make noise if you are standing next to the vehicle listening for it, the noise should not be that audible while you are driving. The vehicle should also be stopped and in park or neutral before switching from 2WD to 4WD or 4WD high. Failure to do so can cause damage to the 4wd system.
A good repair shop should be able to diagnose and repair these issues.
〉 Answered on Feb 9th, 2016 by Helaine Kurot, Owner/Technician at 360 Automotive