Citation V/Ultra/Encore (C560)
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Distraction; Situational Awareness; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Human Factors; Incorrect / Not Installed / Unavailable Part
Myself and Technician Y were working on a Cessna CE560E aircraft inspection. We performed the task which checks the Emergency Braking System.  One of the final steps is to disconnect the [Emergency Brake] line and blow it out with alcohol to make sure that if there's any fluid (Skydrol); that it's cleaned out.  When removing the Right-Hand (R/H) side; the 'B' nut was partially seized and the line broke while being removed.  I capped the line on the aircraft side and took the broken line and placed it on the table by my Lead Mechanic.  I told him  that the line broke and that it needed [to be] written-up and a new line ordered.  It has been three weeks since all of this happened; so I don't know what his exact reaction was as far as a thumbs ups; an O.K.; or even just a nod; but I do know that I was under the impression that he heard me and understood.  I then turned around and went back to cleaning up after the [Inspection] Checks we had accomplished.  Apparently the Lead Mechanic didn't hear me; or misunderstood because the line was not ordered and was not written up and from my understanding it was found on the Post Maintenance Checklist this past weekend.  The broken line was the one that connects directly to the Brake Assembly and going from their Removal and Replacement here is the Part Number (P/N) 6527365-16 and it's found in the Cessna CE-560 Illustrated Parts Catalog (IPC) 32-41-00; Figure 04a; Item # 2. Not sure what could be done differently other than double checking all of the write-ups and parts when your Lead finishes for the day...but not sure that's 100 % possible.  This is the first time I have had to fill out one of these reports.
An Aircraft Maintenance Technician was informed that a broken Emergency Brake System line he had removed and capped off was not replaced on their Cessna CE-560E aircraft. The brake line was discovered missing during a Post Maintenance Check.