Wear indicators on brake pads
The brake assembly probably needs to be cleaned and lubricated, take it to a brake shop where you can get a free inspection and see what they have to say about the wear on your pads, the cleaning and lube should not cost too much.
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!
Possible worn out brakes
You will find that the front brake rotors are located behind the front of your wheel spindle, (behind your wheel and brakes). There you will see the rotors.
something is obviously touching rotor when you brake. Take wheel off and check by spinning rotor.
it is to do with braking systems, vehicles or cycles when all of the pad does not touch the disc or the wheel rim at the same time. The result is brake squeal
A grinding noise in the wheel will either be caused by worn brake pads, or a defective wheel bearing. Remove the left front wheel and inspect brake pads. If the brake pads are OK, you will need to remove the caliber and inspect the wheel bearing.
Well if its more of a squeal, your brake pads are probably low, and need to be changed soon. That will occur more likely if you have rear disc brakes.
The brake sensor is built into the wheel bearing. The whole unit has to be replaced. It is best to replace both bearings. Left wheel and right wheel ---- 1998 models have the sensors as a separate component - See "Related Questions" below for more
That would probably the brake pad wear indicators telling you the brakes need attention soon.
It may be your CV joints