Nissan Pintara Brakes.

Hey i was wondering if anyone could help me? About a week ago someone decided to borrow my Pintara for the night. The next day the police located the car close by my house which minimal damage to it. I went a picked it up off them and then have been driving it ever since. however there was a small very faint grinding sound from the front passenger wheel when braking. i thought nothing of this just thinking that maybe i had just not noticed it previously as the front brakes had recently been changed by a mechanic. However today my brake peddles contact point has began to be very inconsistent. The car still brakes the same but the peddle just occasionally and sporadically requires me to push it down a few extra inches before it makes contact and begins to stop. If anyone can help me out with this that would be much appreciated. Laymen's terms would also be appreciated as im no car guru.
Thanks:runaround::runaround::runaround::runaround: :runaround:

sounds like your master cylinder is bad. also i would have the mechanic check the wheel thats grinding, might be something as simple as a rock stuck in it but could also be a bad brake shoe that was just replaced

righto will do thanks pal