1995 Chevy Astro brake lights and back-up light

Electrical problem
1995 Chevy Astro 6 cyl Two Wheel Drive Automatic

a pleasant day to you sir, I have this problem with my astro, whenever I put on the brakes the back-up light is the one lighting up on my tail lights, please help me out I dont know what seems to be the problem. Anotyher thing is about my vacuum hoses, can you help me out with the connection of the tine hoses near the carburator, I dont know where it goes, it is near the carburator that small hose going and out of that electronic device.