DA40 Diamond Star
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 39; Flight Crew Total 1299; Flight Crew Type 1185
Situational Awareness; Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation - Speed All Types; Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Weather / Turbulence; Ground Excursion Runway
General None Reported / Taken
Aircraft; Human Factors
I was conducting a stage check for my student and we were practicing engine out approaches. On the first attempt a slip was attempted but the nose was too high and the airspeed dropped dangerously low. I took over and attempted to initiate a go around but the aircraft landed on all 3 gear to bounce sharply. I proceeded back to our base and the student and I attempted to get his power off approaches cleaned up and we did multiple touch and goes. After several landings we decided to end the lesson but I noticed that the left brake lost all authority when trying to stop. I took over and prevented a [runway] excursion and tried to slow down in a controlled manner. When I tried to exit [the] taxiway the wind pushed my tail around faster than expected and the plane skidded to a stop just before the hold short line with the nose gear and left main in the grass and snow. No damage to the plane or taxiway lights occurred. No injuries occurred.
DA40 Instructor Pilot reported loss of directional control during landing roll.