We've purchased a new e-bike for commuting, its very heavy and carries a heavy load, and the commute is through a very hilly neighborhood. The mechanical disc brakes have become a constant issue, loosing nearly all braking power in usually about a week's time. I've cleaned the pads to remove the glazing (light sanding) and 91% isopropyl alcohol on the rotors, and even replaced the pads, all to the same result - good for a few days, followed by diminished to total loss of braking power over the course of the week. What is wrong with my disk brakes?
https://blixbike.com/products/aveny-electric-city-bike Tektro Aquila Mechanical Disc Brake, 160mm Rotor