Date: 201703
Local time of day: 0601-1200
Location: ZZZ.Airport, NC
Aircraft: Regional Jet 900 (CRJ900)
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Takeoff / Launch
Airspace: Class E ZZZ
ATC / advisory: Tower ZZZ
Aircraft component: Brake System
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Troubleshooting
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Person Flight Crew
When detected: Taxi
Result: Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem; General Maintenance Action
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: During taxi in on the previous flight (same aircraft; same crew) we received a Brake OVHT message with the LH OB Brake Temperature Monitor System (BTMS) reading 20. The reading returned to normal within about 2 minutes; no wheel fuse plugs blew; and all other brake indications were normal. A mechanic reset the BTMS and signed off the logbook with operations check normal. On the next takeoff; we received a brake overheat warning when above 80 knots but below V1. I continued the takeoff. We left the gear down momentarily. Before we got to 1000 feet AGL; the warning went away and the LH OB BTMS went to dashes.After a brief discussion about the indications; I elected to raise the gear. We consulted the QRH; but with no more warning indication; we continued to [destination]. Several minutes later; while cruising at FL200; the Brake OVHT warning reappeared. We ran the QRH and extended the landing gear. Over the next few minutes; the LH OB BTMS oscillated several times between dashes and red value of 20. To be conservative; I elected to keep the gear down; [advised ATC of emergency condition]; and proceed to [destination] runway XYC (10;000 feet long). We informed the FAs and passengers about what was happening. Landing was uneventful; but we did have CFR check the brakes for any signs of overheating before we taxied to the gate.


Second narrative: Maintenance was performed at the gate to reset a faulty BTMS indicator on the left outboard tire. After maintenance accomplished; released to fly to destination. On takeoff roll at above 80 knots; the same BTMS fault for the left outboard tire and associated warning message appeared. The decision was made to continue the takeoff and let the gear hang until a safe altitude and allow the gear to cool. Knowing about the previous fault; when the fault extinguished; the gear was raised and climb out continued normally. At cruise; the fault returned and; as a precautionary measure; the QRH procedure was completed for a Brake OVHT red message. The inflight procedure was followed and since the left outboard tire BTMS had reverted to dashes; the decision was made to complete the procedure as if the gear was still hot was accomplished. The gear was left down for the remainder of the flight. The passengers were informed of the issue and kept in the loop for the entire flight. Throughout cruise the faulty message cycled on and off 10+ times. With enough fuel to make it to the destination; we continued. A planned was made to use the longest runway (XYC) and to allow the aircraft to roll all the way out. An emergency response vehicle was requested to confirm the left landing gear situation after stopping clear of the runway. Once all clear; taxied back to the gate.


Synopsis: CRJ-900 flight crew reported receiving a Brake Over-Heat message during takeoff roll and then at random times during the flight.