Narrative:

Aircraft pulled to left during takeoff roll. Rejected takeoff. Returned to hardstand for maintenance to investigate. Normal taxi to runway xl for takeoff. Wind 100/5; temperature 28C. Engine thrust was set for takeoff; with normal acceleration and stabilization. During takeoff roll; PF (pilot flying) needed to apply increasing right rudder pedal pressure to counteract the aircraft's tendency to pull to the left. At approximately 50 kts the PF was unable to maintain runway centerline. The pm (pilot monitoring) assumed control of the aircraft and rejected the takeoff. At approximately the same time the pull to the left ceased; allowing the aircraft to be realigned with the runway and track straight ahead. Maximum airspeed was approximately 70 kts. Aircraft was taxied to a hardstand. Maintenance personnel examined all tires for wear or damage; checked all four main wheels for proper rotation; and bled all brake lines numerous times; noting a significant amount of air in each system. Tire #4 was replaced. Ca (captain) and first officer (first officer) both noticed that the brakes on tire #1 were significantly warmer than those on all other tires.this rejected takeoff occurred on a relatively warm day; at a high elevation airport; after a relatively short turnaround. It is the opinion of the ca and the first officer that one or more brakes on the left truck were binding during the initial takeoff roll; but then released as the takeoff was being rejected.as first officer and now ca on the 737-800; I have more than X000 hours in this aircraft. I have never experienced anything like this; nor have I heard of it. If the occurrence was due to thermal issues (the combination of temperature; elevation; and short turnaround time); as in if this problem is a known issue; it would have been nice to have had the knowledge to anticipate the possibility of a problem. At a higher airspeed; with a slower reaction by the crew; or with a compounding thrust asymmetry; this event could have easily led to a runway excursion.

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Original NASA ASRS Text

Title: B737-800 flight crew reported experiencing a brake malfunction during takeoff roll.

Narrative: Aircraft pulled to left during takeoff roll. Rejected Takeoff. Returned to hardstand for maintenance to investigate. Normal taxi to Runway XL for takeoff. Wind 100/5; temperature 28C. Engine thrust was set for takeoff; with normal acceleration and stabilization. During takeoff roll; PF (Pilot Flying) needed to apply increasing right rudder pedal pressure to counteract the aircraft's tendency to pull to the left. At approximately 50 kts the PF was unable to maintain runway centerline. The PM (Pilot Monitoring) assumed control of the aircraft and rejected the takeoff. At approximately the same time the pull to the left ceased; allowing the aircraft to be realigned with the runway and track straight ahead. Maximum airspeed was approximately 70 kts. Aircraft was taxied to a hardstand. Maintenance personnel examined all tires for wear or damage; checked all four main wheels for proper rotation; and bled all brake lines numerous times; noting a significant amount of air in each system. Tire #4 was replaced. CA (Captain) and FO (First Officer) both noticed that the brakes on tire #1 were significantly warmer than those on all other tires.This rejected takeoff occurred on a relatively warm day; at a high elevation airport; after a relatively short turnaround. It is the opinion of the CA and the FO that one or more brakes on the left truck were binding during the initial takeoff roll; but then released as the takeoff was being rejected.As FO and now CA on the 737-800; I have more than X000 hours in this aircraft. I have never experienced anything like this; nor have I heard of it. If the occurrence was due to thermal issues (the combination of temperature; elevation; and short turnaround time); as in if this problem is a known issue; it would have been nice to have had the knowledge to anticipate the possibility of a problem. At a higher airspeed; with a slower reaction by the crew; or with a compounding thrust asymmetry; this event could have easily led to a runway excursion.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.