my girlfriend had her brakes done 3 months ago, they've been working fine but now they squeel like their going out only during low speeds :/

braking power is still about the same

btw she have an 2007 c230K sports package (late 2006 i guess? her registration says 2007)

anyone have ideas?

i can't really see how much life the brake pad has without the wheel off, or perhaps i don't know what to look for