Flight Crew Private
Flight Crew Last 90 Days 140; Flight Crew Total 170; Flight Crew Type 170
Confusion; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Clearance; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
Flight Crew Overcame Equipment Problem; Flight Crew Rejected Takeoff; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
While taxing to Runway XL; we encountered some COM issues. I did transmit over the ground frequency but they could not hear us. Upon reaching the hold Short Line for Runway XL; I was unable to stop the plane. The brake pedals lost complete pressure and I had no control over the plane. I immediately applied the parking brakes; however; the plane went past the hold short line and turned left into the grass. There was no damage to the plane; or any airport environment. Airport Personnel arrived and assisted me. They took down all my information and then towed me to the FBO. A local ground staff did check out the plane and confirmed that the brakes have failed and lost all pressure. I did inform the flight school and squawked the airplane for all the issues. There were no people harmed nor any damages reported.
Pilot reported loss of normal brake system during taxi into position on runway; causing a runway excursion.