A C206 instructor pilot reported that the aircraft's right brake failed on taxi out because the stud...

Attributes
ACN	912048
Time
Date	201009
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Stationair/Turbo Stationair 6
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	None
Component
Aircraft Component	Normal Brake System
Person 1
Function	Instructor
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Commercial Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 61 Flight Crew Total 972 Flight Crew Type 10
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Ground Excursion Taxiway Inflight Event / Encounter Loss Of Aircraft Control

Narrative:

During a taxi on a training flight I noticed that my student was riding the brakes a little bit when leaving the ramp. I commented that overheating of the brakes and overuse is a primary cause of failure. As we turned from taxiway C to a it felt like my student stopped his brake use. Toward the end of the taxiway he commented that something didn't feel right and called for me to take the controls. When I did I felt left brake pressure but none on the right side at all. With an estimated 8-10 yards left and too much speed I applied full back elevator and what brake pressure I had. The aircraft turned to the left slightly and we departed the end of the taxiway. No damage was done to runway lights or the aircraft. Engine power was used to climb back onto the taxiway and we returned to the ramp for a full inspection. No noticeable defect was noticed and mechanics were scheduled for a more in depth inspection the following day.as a flight instructor I was surprised that my student would want to continue the flight after something like this happening. He; the owner; was angry that I did not want to continue the flight. This served as a reminder that no matter what the circumstances as a flight instructor with a student pilot on board I am always pilot in command.

Original NASA ASRS Text

Title: A C206 Instructor Pilot reported that the aircraft's right brake failed on taxi out because the student pilot also aircraft owner; over used the brakes. The aircraft departed the taxiway but no damage resulted.

Narrative: During a taxi on a training flight I noticed that my student was riding the brakes a little bit when leaving the ramp. I commented that overheating of the brakes and overuse is a primary cause of failure. As we turned from Taxiway C to A it felt like my student stopped his brake use. Toward the end of the taxiway he commented that something didn't feel right and called for me to take the controls. When I did I felt left brake pressure but none on the right side at all. With an estimated 8-10 yards left and too much speed I applied full back elevator and what brake pressure I had. The aircraft turned to the left slightly and we departed the end of the taxiway. No damage was done to runway lights or the aircraft. Engine power was used to climb back onto the taxiway and we returned to the ramp for a full inspection. No noticeable defect was noticed and mechanics were scheduled for a more in depth inspection the following day.As a Flight Instructor I was surprised that my student would want to continue the flight after something like this happening. He; the owner; was angry that I did not want to continue the flight. This served as a reminder that no matter what the circumstances as a Flight Instructor with a Student Pilot on board I am always pilot in command.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A C206 instructor pilot reported that the aircraft's right brake failed on taxi out because the student pilot also aircraft owner; over used the brakes. The aircraft departed the taxiway but no damage resulted.