I've done a quick search for replacement pads, I had no more luck than previous searches. The problem with these brands is only complete assemblies are manufactured in great numbers, few if any replacement consumables are made. Once the batch run is completed the brand name just disappears. Another example, is trying to find replacement wheel bearing cones for Joytech and Quando front hubs, they are simply unavailable. When enquiring with the E-bike supplier they always give the same reply, they are not E-bike specific, so they do not stock them.
By all means continue searching, but sooner or later you may have to consider replacing the caliper assemblies. If you are happy with the machine, and would like to prolong it's life, I suggest you replace the calipers with Avid BB 7's. They will cost you between £40 to £60 each and come complete with a new rotor and all fittings. I realise this is expensive, but you would be confident that replacement pads will be available for many years.
The 160mm version is perfectly alright for normal cycling use and would be a direct replacement fit. If you decide on the larger 230mm version you would need adapter brackets, these are supplied with the kit. The BB7's are very easy to fit, the three axis adjustment means no shims are required to get a perfect alignment. They are very powerful brakes.
As a matter of interest, Zoom, Jac and probably others are clones of the Avid BB7
I hope this may help
All the best
Bob
Edit: Blimey, prices have gone up a bit! The cheapest I could find
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