I bought, not even 2 months ago, a Trek FX 7.2 bike.
Rode ~1000 km on it.
At some point, the rear braking started to sound a bit "metallic" and lost around half of its efficiency: even if I press very hard on the lever at low speed I cannot block the wheel (not that blocking the wheel is any useful but a functioning brake would do it).
I looked at the shoes and they look pretty used and "unevenly" : the bottom of the shoe is almost brand-new whereas the top looks more used (but it does not feel completely dead: it "feels" soft when touching it so it is still rubber and not the metal behind ... so I don't think it explains the metallic sound).
Nonetheless, I believe the shoe should have been used evenly and that it had not been properly set-up to begin with right?
Nevertheless, my re-seller told me when I bought the bike to come in with it after 2 months for a 2-months revision so I will do this in any case and talk to him about this: a bike with 1000 km is still basically new compared to its lifetime... so it should have functioning brakes...
Still I am trying to get better in the whole cycling mechanics thing, so just from an educational point of view, let us forget about the revision: what would my options be?
From another point of view, I intend to keep this bike for a while and intend to maintain it and possibly improve some of it (next step: a Brooks saddle and SPD pedals ) so I was considering (not directly related to my very current braking issues) change the whole brakes and upgrade them by better ones...: assuming I stick to V-Brakes, can I keep the same levers and cables?