Re: brakes
from what you described..when you fist tried out your brakes and you felt the pads shutter..my guess is thats when the wd40 maye have burned off
anyway..just in case if you have not done so already..you might want to take off your disc pads..and look at the surface of them...maybe scuff them up with some sand paper sprak with some brake cleaner and them re inasall them
anyway...thats what I would do
Mike