Sort:  

I don't think so. It's on the inside of the caliper. It's working now and I adjust the pads with tightening the cable, but the finer adjustment with the allen key cannot be done. And a new brake is quite expensive, so I will leave it for now.

Sure, makes sense. Or you could migrate to hydraulics, though I think it would me even more expensive.

For now they work fine, so replacement isn't needed yet.
In the long term I want to buy a new bicycle. Then I would go for hydronic disc brakes.