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im thinking fluid also. the light that comes on for the ebrake is the same that comes on for fluid problems....the only difference is that the light only comes on when the ebrake is engaged if it is the ebrake that is making it come on. if it is coming on when you press the brakes, the fluid is more than likely low. if its not low, move on to another issue.
to check for a seized caliper, you would have to take the wheels off and look at the rotors and pads. if the rotors or pads are wearing unevenly (one side of a single rotor or pad set is wearing more than the other side on a single wheel) you may have a seized caliper. another way to check this is to take the caliper off of the rotor and depress the piston. if the piston is extremely hard to depress, wont depress, or wont push out when the pedal is pushed....you have a seized caliper. if it moves freely inward and outward, look elsewhere.
other issues you may have:
bad master cylinder
bad proportion valve
crimped lines
and of course the ebrake switch (but i doubt this one)
but start at the fluid level and work your way around the car eliminating issues as you go. we are all here to help if you need it.
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