I have a Gepida Alboin SLX Trekking pedelec. The brakes are getting worn--the bike doesn't stop as easily and the handles have to be squeezed in more. I just got the bike, slightly used. What am I looking at cost wise in terms of replacing these? Is it a routine repair in a good bike shop? Is there just one pad for the brakes or are there options to upgrade? Is the Shimano Deore BR-M6000 considered a good brake system? Last, is there a point at which I can f*ck up the brakes if they aren't changed, or do they just get worn to the point of not being able to stop? Thanks for any help. This is my first ebike. Thrilled with it so far, and when I first got it the brakes were amazing.