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The brake light comes on and beeps if there is a problem with the ABS system or the fluid is low, the overheat light comes on and beeps if the vehicle is overheating or the coolant is low. So the question is which one is it. If you look in your manual it will direct you to the proper warning light.
I suggest you check the coolant level in the coolant expansion tank and in the brake fluid reservoir, adjust if necessary and see if the light comes back on. If so let me know which light it is and we can proceed.
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