Privately Operated CubCrafters CC11-160 – Incident after Landing

N265WA, a privately operated CubCrafters CC11-160 aircraft, was conducting a VFR flight itinerary from Beaver Creek, YT (CYXQ) to Watson Lake, YT (CYQH) with one pilot and one passenger on board. The aircraft completed an uneventful landing at CYQH and during rollout, the pilot was unable to maintain directional control.
The left brake was ineffective, and the aircraft experienced a ground loop. The right wing contacted the ground and received substantial damage. The two occupants received no injuries.
A post-accident inspection found the left brake line leaking at the brake caliper