B737-700
Flight Crew Last 90 Days 378
Training / Qualification
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Regained Aircraft Control; General Maintenance Action
Human Factors
During landing roll; normal manual brake application produced a strong pull to left. As Pilot Flying; I compensated using differential braking and rudder pedals to keep aircraft on runway while decelerating. The Captain took over controls to exit onto D7. I mentioned the abnormal challenge to centerline control; and said it might be the brakes. He tested both wheel brakes at taxi speed; and response seemed normal. I said we should call out Maintenance to gate and he agreed.At gate; Maintenance discovered that #4 brake was cold. The associated brake hydraulic supply coupling was not fully seated; rendering the brake inoperative. It appeared that a recent brake change in ZZZ1 on that assembly was not completed correctly. The ZZZ Maintenance Personnel reconnected the supply and tested the brakes; yielding normal operation. The Captain wrote up in the logbook that the aircraft pulled left on landing. I am grateful that we discovered this on landing; with a light Passenger load; low approach speed; and manual braking. A heavy [Rejected Takeoff] on a short runway would have produced a very different outcome.It appears that a safety critical system was not properly returned to service. The procedure and personnel involved need to be looked at closely; as well as any work performed by them.
B737 flight crew reported faulty brakes during landing roll out.