I'd definately get your brakes checked, (unless the previous
owner had it done before selling it). My Honda started "creaking",
(as people got in/out), around 36,000 miles, which is around
the "overhaul" period; (don't ask me what they do,
but the car was like new when I got it back). I really don't
think this second problem's with the brakes, though, unless
you're a girl who barely engages the e-brake due to infirmity/
"not-giving-a-shit"

. But I let my Mom borrow the Nissan
when she needs it, and I'll hear creaking when I jump in for work,
only because she barely engages the e-brake.