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Q: How do I reset a brake warning light switch? on 1990 Chevrolet 2500 Pickup

I have an 1985 Chevy truck. The master cylinder went bad causing the fluid to leak out of the back reservior causing the brake warning light to come on. I know the switch is located on a crossmember under the radiator. How do I reset this switch. I have replaced the master cylinder and have bled the brakes, but the light is on and I don't think I am getting full fluid pressure to the back brakes. I need to know how to reset the switch.
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