Browsing Problem over WAN Link(nt4.0)

I cannot view the Master Browser(PDC) from a remote location BDC over a WAN link. It cannot locate the PDC, although logs in to the Domain. Our BDC cannot see the PDC through NN or Server Manager, I get unable to locate the Master Browser or PDC. Weonly have one domain and the BDC is in a remote location connecting over a WAN. I can find other PC’s and ping across the WAN.