well, I dont really know if its a problem, but I replaced the bulb for the handbrake warning light...when the key is in the "on" position (but the engine not started), the light flickers, and there is a noticable buzzing sound. When the handbrake is released (engine still off), the light turns off, like its supposed to, but when you press the brake down to a certain point, the light flickers once again.

When the engine is turned on, everything is fine. My question is whether this is/can be a problem? any ways to fix it? thanks! -JON

Check sensor on your master cylinder, you may need to bleed it

Isn't that light also associated with master cylinder? maybe try the reset switch on the master cylinder?