How do you bleed brakes in 1978 Chevy pick up?

On the front brakes you will see the caliper on the backside of it it will have a small valve that looks like a grease fitting. Remember it is the one on the caliper it self. Get someone to bump the brakes up tight. Once they have them tight hold the brake pedal down. While the brake pedal is held down use a wrench to brake the bleedervalve lose. once you do look for bubbles in the fluid. repeat intill bubbles are gone. Same way on the backs.