Did you have the rotors turned or replaced? If the rotor surface was not resurfaced it can often cause noise, premature wear and uneven stopping.
Normally a rusty rotor would not make a grinding noise. A grinding noise from the brakes usually indicated that the pads or shoes are worn down.
Diod you check front brake pads
The brake pads are worn out and need to be replaced. The grinding sound means your brakes are about to stop working.
They could, yes.
When you're brake pads be calm worn, they will have a slight shimmy when you apply the brakes. When the brake pads are completely worn out they will make a grinding noise.
When it is time to change the brakes on your 2001 Mitsubishi Montero, they will make noises. There could be a grinding or squealing noise that you will hear.
If the car was sitting for a while and it was damp out, rust forms on the brake rotors. For the first mile or you will hear a grinding noise when braking until the rust has been removed by the brake pads. The longer it has been sitting, the louder it may be. This is normal.
They will make a grinding noise that's how you can tell.
State your noise.
Have your brakes checked, rust or wear on brakes can cause grinding when turning.
The high pitched squeal is the built in brake pad warning device telling you the brakes need attention. The grinding noise is what happens when you ignore the squeal warning noise. Have a trusted mechanic service the brakes NOW!
Sounds like the brakes are shot! At this point I wouldn't want you to drive any further than your closest repair garage.