Most times you will find that there is a bad constant velocity joint. This can make a serious grinding noise because the joint will be running the outer race and inner race together instead of having the ball bearings to run on.
Another problem could be the brake dust shield hitting the rotor. both possibilities can be checked by removing the front tire. The dust shield you will be able to see, but the CV joint you will have to move the axle shaft to see if it is loose.
Jack the front of the car up and see if there is any play in the wheelbearings...(rock from side to side)
SOURCE: grinding or rubbing noise in left front wheel, mostly when braking . What do i look for?
Grinding is a sign on brakes in need of replacement. Your pads are worn through and now the metal backing plate of the pad is grinding up against the rotor. Replace the pads and rotors asap to prevent further damage.
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