having "hard" brakes is usually a mix of issues. starting with almost used up pads and the material that is left on the pads is fully glazed over making it insanely hard to compress. (normal pad composite has a little "give") having steel and glass rub together does not give a lot of play in the system.
take the wheels off and inspect the pads very carefully for wear and glazing. you should still see a small groove in the middle of the blocks seperating the pad in 2 (kinda like a tread line on a tire). if that 2mm wide opening is gone you need to replace them. ususually there is less then 4mm left at that point and worn out anyway.
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