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You have two brake switches. One is a normally open switch, the other normally closed. They cross-check each other.
Hyundai's info for P0504:
The Stop lamp switch is used to judge whether the acceleration system is abnormal or not. The stop lamp switch has a duplex system(signals brake test or brake light) to memorize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously.
Checking output signals from both brake switch. When all of them are ON or OFF simultaneously, if abnormal signal is detected for more than 0.5 sec., an error is recognized. And if this condition lasts for certain period, PCM sets P0504. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
The '07 models had some issues with brake switches. Yours could just be another of those. Ask your dealer about TSB# 09-01-018. Should be caught by any dealer if you take it in for service for any other reason. This will be done on their nickel.
"IMPORTANT: DEALERS MUST PERFORM THIS CAMPAIGN ON ALL AFFECTED
VEHICLES WHENEVER AN AFFECTED VEHICLE IS IN THE SHOP
FOR ANY MAINTENANCE OR REPAIR."
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