Some help please guys...

Just put some front brakes on my cossie focus, AP 4 pots 5200 and 330mm disks, unsure of what pads they are but they've got M1155 4143M1 wrote on them. Also just fitted a bias pedal box, new cylinders, ressy's and braided hoses. Took the car out today and about a mile up the road the front brakes seized on, after about ten mins when the brakes cooled down they unseized and where fine. Turned around and headed home and by the time I'd got back when them warmed up again they seized up. Any ideas as to whats causing this....please!!!!!

Thanks

Rich