recently i've had an issue where the brake pedal is extremely difficult to depress after the car sits overnight. i basically have to stand on the pedal to the get the car to stop first thing. after a few minutes, it's back to normal.

i've also stopped hearing the "buzz" sound that the brakes used to make when i first start the car.

i've read that this is probably the brake pressure switch going bad?

i just want to know if this is a relatively easy fix? is it the round silver part directly under the engine fuse box? it has a hose and 2 wires leading from it and it looks like it's held in place by 2 bolts with rubber grommets?

can anybody recommend where to get one besides the dealer?

thanks for all help! much appreciated!