I took my front wheels off yesterday to change tyres and i noticed that on my passanger side brake the brake pad was only using under half of the disk surface on both sides of the disk (see pics below) i noticed it was also doing this on the inner side of the drivers side disk. The pads look to be the right size. The pads and disks look quite new and were fitted before i bought the car about 7 months ago does anyone know what could be causing this thanks.