My saga got that high pitched sound when braking, what's the problem?? If need to repair, how much would it cost?

And the alarm got prob as well.. when i wanna unlock my car, i hit the 'unlock' button on my car key... this only disables the alarm (it shud by right unlock the car and disable the alarm together), but my car still locked.. have to use key to unlock.. going 2 claim warranty as well. Aigh.. few months only..got problem already -.-