73 duster front brakes locking up when coming to a stop.

stock 4 piston KH or 73~76 single pistons or something else?

manual or power?

any other work done? any system parts replaced?

is it if you slowly brake it'll brake fine, but if you romp it it'll lock up and then release and roll fine once stopped?
Stock power brakes...when you stop normal the rear locks up.....soon as you release it it rolls fine...it's been doing this since I bought the car..previous owner said it was locking up as well