To clear the code you will need to fix the problem, than the code will erase. The brake switch controls the brake lights. It has an air line conection with two electrical wires. They are sometimes located under the dash or console or in the middle of the truck (check with dealer) .Checking the switch is done by jumpint the two wires.The coolant level sensor is located usualy on the side of the water reservoir or on the top side of the radiator.
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No, the brake switch would not trigger the oil/water light.
If no air, than it would be a hydraulic line connected to the brake switch.
How did you get these codes? from a shop/dealer?