Brake have clanking noise

Likely picked up a foreign object in the pad. Pull the pads and make sure no rocks are there. You can ignore the groove.

problem is in the 4wd drive operation
disconnect 4wd back to Awd (Turn the knob selector)

If the fluid level is again low, you are losing it; if not, the level sensor is likely bad. Lost fluid indicates a failed master or slave cylinder at one of the wheels. The squealing you are hearing isn't likely from the brakes but from a belt that needs replacement or at least tightened; the fact that is squeals when starting and in turns, indicates that the steering pump being driven by that belt is slipping a little under the stress of making turns. This often goes away once the engine room is warmed up since the belt rubber gains a little grip when warm which stops the squealing.

I am having the same problem. I am thinking it is a sign of the alternator going out. The light and bell sounds also sounded when I pressed the door lock button to lock or open the doors.

Any grinding is not good. This almost sounds like a sticking brake rotor/caliper which is popping free, or a parking brake dragging. Either way the fact that it stops does not mean it will fix it self. I would inspect all 4 brake rotors for excess wear.
try to determine if this happens after parking and braking, then isolate the area you thing the noise is coming from.
Separate from that it could be a gear issue in your trans at low speed but you need to get it checked ASAP as it will only lead to greater expense.

Check your brake fluid level, make sure its to the "full" mark

that means they are 6/32 so i would let them go lower you still got alot of life let in them,,,i would go to 2/32,,you should hear the brakes squealing when they are really low,,you should get another 6000 out of the ones on your car now,i ouwld wait alittle,just have them checked every oil change

Have the brake rotors turned.

Try pushing down on the parking brake while pulling on the release handle.Downward pressure may make the release handle easier to pull.Good luck,
ChevRev

Clanking? Im Guessing Brakes But Please Clarify The Sound. Is It Off And On Or Continuous When Its Doing It?