could be that your switches on the master cylinder are not switching anymore
if you have fluid and good pressure to each wheel then inspect the switch
or if you have a switch under the dash on the pedal inspect that one
it is possible to break the switch under the ebrake so that it shears off the plastic and stays on all the time
take a look at that first since its pretty easy
now as for the reverse creek....probally your shoes are worn out or stuck due to the adjusters
could also be your front pads are worn down and the calipers are sticking
you'll just have to spend a few hours inspecting the fronts, playing with the rears, and looking at your switches
no need to remove the rear drums just lift the rear tire off and (with the engine running) spin them and hit the brake lightly
the fronts you should remove the tire and closely inspect them
it also helps to remove the caliper and look at the pads.