Car losing power, battery life drained, then truck dies out.

Going to rite-aid, I noticed head light's were dim, i
thought it was just me. As I was apart to park,
truck started to spudder, I looked at the gas gauge
and noticed all gauges were at zero, even My MPH
gauge. Then struck dies out completely. I try to
start it and battery is dead. The battery is brand
new, only been on there for 4 months. I go in rite
aid and come back out, truck starts up. But all
light's are fading out. I start rushing home, and I
lost all light's and power to gauges and truck. It's
still barley running until it finally dies completely a
block away from home. I noticed the computer
read out before it died, Check Brake System. Any
help on ideas, Or advise, would be greatly
appreciated.