braking

hi all, Baffling issue with my sisters in laws brakes, it is making a intermittent grinding type noise not on every rotation though and can feel slight knocks on pedal Things done. Checked rear discs ok put new pads on.. Replaced front disc and pads.. Drove with handbrake pulled up doesn't do...

I have a vectra c 2.2 sri and have owned it for 3 years,its only done 71k miles and i love it but lately its been pulling to the left under braking and pulls to the right when accelerating. Ive changed the brakes as the left was binding and changed the drop links as it was clunky for a bit,any...