1959 Ford Thunderbird BRAKE LOCKUP

HAVING PROBLEMS WITH THE BRAKES LOCKING UP AFTER SHORT USE AND NOT RELEASING PRESSURE TO ALLOW WHEEL MOVEMENT.

AFTER LOOSENING BANJO BOLT ON THE MASTER CYL AND ALOWING A SMALL AMOUNT OF FLUID TO LEAK OUT TO RELIEVE THE PRESSURE THEY AGAIN WORK FOR A SHORT TIME AND THE CYCLE STARTS OVER AGAIN WITH WHEEL LOCKUP.

A NEW MASTER REPAIR KIT WAS INSTALLED EARLIER, MAY HAVE HAD SOMETHING TO DO WITH IT. BUT DON'T KNOW.

ANY IDEAS?

THANKS