Piper PA28 accident near Oregon, Wisconsin, July 19, 2018

The NTSB's narrative final · quoted from the NTSB record

According to the pilot receiving instruction, during instrument training, she and the flight instructor noted that the left brake was less effective than the right brake during landing. Following the training, the pilot receiving instruction returned to her home airport, and during landing on the wet, grass runway, she executed a go-around because there was insufficient runway to safely stop the airplane. During the second landing, the airplane touched down with about two-thirds of the 2,600-ft-long runway remaining. During the landing roll, the pilot receiving instruction ensured that the throttle was in the idle position, and she retracted the flaps and applied aft pressure to the yoke. She applied the foot brakes and then the hand brake and again noted that the left brake was less effective than the right brake, and the airplane continued to slide on the wet grass. The airplane overran the runway and impacted a drainage culvert. Subsequently, the right wing struck a barn, and the left wing struck a trailer. The airplane sustained substantial damage to both wing's spars and ribs. According to the Federal Aviation Administration aviation safety inspector who examined the airplane, there was a pool of hydraulic fluid on the ground that appeared to be consistent with an O-ring failure or displacement. He affirmed that, although degraded, the brake would still have been functional but would have required more input by the pilot to build pressure within the brake line.

The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.