@brcisna:
Will I be able to run parallel bridges( current and future setup) between School A, B , & C ? without taking down the current vpn,,, School, A to School B ,,,and bridge setup,,,,from School B to School C as it is now?
If I understand you correctly then the answer is no. If you bridge A, B, and C together then you now have two DHCP servers active on the same broadcast domain (routers A and B), giving out leases for two different networks. Example LAN host 1 (could be at any of your locations) will get a lease from DHCP server A and get routed that way, LAN host 2 will get a lease from server B and get routed that way. LAN hosts 1 and 2, if they try to talk to each other will do so through the VPN.
The most obvious way to directly connect locations A, B and C without giving up the existing internet connections and vpn is to place a router at each location. That router will serve as gateway for all local hosts, and you will have a dhcp server on site (pfsense or otherwise).
It's generally better to route large or outdoor wireless networks rather than bridge anyway. This prevents broadcasts from propagating across every link, and helps to contain or avoid layer 2 issues such as broadcast storms and other DOS conditions.
Are you planning to keep the wireless connection between B and C, creating a triangle where each location has a direct wireless link to both of the other schools? There are advantages to that, such as load balancing and redundancy.