Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Gate; Flight Crew Rejected Takeoff; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft
We were cleared to line up and wait; [then] cleared for takeoff. I transferred controls to the FO (First Officer); and we began our takeoff roll. At approx. 70 kts the yellow caution light [illuminated] and we had an EICAS message 'HS VALVE 2 FAIL'. We both called REJECT. I took control of the aircraft and brought it to a stop. We exited the runway and assessed the situation. We proceeded to the west hard stand; contacted Maintenance; and were instructed to return to the gate and deplane; that the aircraft was unairworthy. We returned to the gate without further incident.
I was the pilot flying and the CA (Captain) was the pilot monitoring [and on takeoff roll] a High Stage Valve Failure was indicated by the EICAS at approximately 65KIAS. The appropriate actions were taken from the CA immediately after discovery of the message. The takeoff was rejected; the CA brought the thrust levers to idle and began taking the actions to bring the aircraft to a safe speed to exit the runway to the first available taxiway. I called Tower to notify them that we were a rejected  [takeoff] aircraft.
EMB-145 flight crew reported rejecting the takeoff after receiving the EICAS alert High Stage Valve Failure.