i noticed the front brake pads are down to about 1mm,is it advisable to replace both front & rear at the same time.the bike's covered 14,500 miles.
Rears will hardly be worn,.... oh wait, you have linked brakes so, yes probably best to at least check the rears. I am currently at 62k miles and still have OEM rear pads in mine. Have gone through 3 sets of pads and am on 2nd discs on the front.
Boomer via Tapatalk
Boomer is right. Just check them to see how much life is left in them. There's no need to change them unless they are worn out of course.