back brake
i purchased an 09 250 with about 9k miles for $1700...bike seems to be in good shape BUT...on two seperate occasions the back brake gave out to the point where i could push it all the way down and theres zero resistance and the bike certainly doesnt slow down. the second time this happened, i kindve pushed upward on the break with my foot a few times and this seems to have helped bcuz it returned to normal. im new to riding and dont kno much about bikes....does this sound like a more serious issue...or do the brakes need to be replaced?
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