Brake rubber bits ?

[Sprocket]

Can anyone tell me, if seal kits are available for the brake master cylinder and caliper for these bikes, or is it the complete assemblies being ''cheap'', they are not worth repairing ?

The dealers I have contacted regarding seal kits say they hold no stock for these items, tell me the Chinese do repair assemblies not just replace them, seal kits are a maintenance item not so much a repair item.

I have come across the need for the ''rubber'' parts after finding both caliper and master cylinder contain rust which has corroded parts so the assemblies do not function as intended. Interestingly, the corrosion is behind sealed in area of the assemblies, so my guess is the contaminant ingress has not happened in normal road use, it was there before, problems with production perhaps.

Properly functioning brakes are essential.