Citation V/Ultra/Encore (C560)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Executed Go Around / Missed Approach; Flight Crew Landed in Emergency Condition
Aircraft
Power brake circuit breaker popped when landing gear was extended; illuminating the LO BRAKE PRESS and ANTISKID INOP warning lights.  We executed a missed approach and received delay vectors to complete the appropriate checklists.  During vectors; we informed ATC of the problem and notified them that we would need to stop on the runway and be towed.  ATC acknowledged; and we returned for the approach.  Approach and landing occurred without incident and we stopped on the runway using the emergency braking system.  Airport operations escorted the tug on the runway and we were towed to the FBO without incident.
On our approach the Captain (Pilot Flying) called for the gear down and landing checklist.  I selected gear down and began to read the checklist.  When I got to the annunciators part of the checklist I noticed the LO BRAKE PRESS and ANTISKID INOP lights where on steady.  Just a few seconds after that the master caution light came on.  I pulled out the checklist and read that we may need to use emergency brakes.  The Captain told the Tower; asked for a vector and altitude and started a go-around.  We decided to leave the aircraft configuration as it was until the checklist was done.  We followed the checklist and found that the power brake circuit breaker was popped.  I finished the checklist then called the Duty Manager to alert him to the situation.  The Captain and I discussed what runway we needed since the checklist calls for original landing distance times 1.6.  This number was just short of 5000 feet.  Even though our original runway was longer than this; 8600 feet; we chose the longest runway.  We alerted ATC of our runway choice and I alerted the FBO that we would need a tug off the runway.  The approach and landing went just as planned.  We were able to stop the plane about half way down the runway.  Since the checklist calls for no taxing we shut the plane down there and waited for the tug.  The only thing I would have done different would be to declare an emergency.  We kept ATC in the loop about our situation and they were very helpful; but we should have declared an emergency.
CE-560 flight crew reports a normal brake failure when the landing gear is extended due to the power brake circuit breaker was tripping.  A go-around is initiated; checklists are completed; and a normal landing ensues with braking supplied by the emergency braking system.