2001 Chevy Blazer smokin hot brakes

The most common reason for smoking brakes is a stuck caliper. If your car's brake system uses floating calipers, they are designed to slide around to function properly. Calipers sometimes become stuck, locking the brake into place. This creates enormous friction as you drive, creating smoke and a foul odor. Stuck calipers are usually caused by dirt or corrosion that hinder the caliper's movement.
The car's wheel cylinder can also become stuck due to dirt or corrosion. A stuck wheel cylinder causes the brake shoes to continue pressing on the drum despite a release of the brake. The brakes will then smoke and emit a bad odor. Could also be the ABS unit-