every time i step on the wil mild force they lock up. It is a 69 dart with 73 duster complete braking system. I have several newer cars without anti lock and they don't lock up nearly like this.
New calipers ? New hoses ? You could urn the wheels by hand when off the ground . If one or both drag the pads, loosen the bleeder. If pressure relieves its a hose or some fluid related. If the pdrag doesn't relieve the caliper is sticking.