Probably but not necessarily
You really should get all the wheels off and have a look closely at ALL the pads and rotors.
Better still when the wheels are off, remove ALL the pads and inspect them properly.
If you feel that you are not up to this, I can direct you to a garage in Aberdeen who know there way around a Zed and would be happy to have a look for you. They will also fit any parts that I supply, so no drama there
Drop me a PM if I can help you further mate
Regards,
Alex.