PA44 instructor pilot reported that on landing roll aircraft had right brake failure causing aircraf...

Attributes
ACN	980394
Time
Date	201111
Local Time Of Day	0601-1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-44 Seminole/Turbo Seminole
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	None
Component
Aircraft Component	Brake System
Person 1
Function	Instructor
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Flight Engineer Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 300 Flight Crew Total 9000 Flight Crew Type 50
Events
Anomaly	Aircraft Equipment Problem Critical Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway

Narrative:

[We] exited runway 8 on rollout after normal landing. [I was] advised by student (holds commercial sel; MEL add-on; 1;500 hours; 15 in type) that aircraft brakes were inoperative on right side while attempting a right turn after exiting the runway. Student attempted to complete right turn using differential throttle settings. Aircraft didn't respond and departed the left side of the taxiway at a slow speed and came to a stop in the grass beside the taxiway. No damage or impact with taxiway signage or lighting. Aircraft was taxied at slow speed back onto the taxiway and returned to the hangar where it was submitted for repair by a qualified mechanic. Mechanic advised that the right brake cylinder had an O ring which had failed allowing the hydraulic fluid to escape and caused the loss of the brake on the right side. Aircraft was repaired and returned to service.

Original NASA ASRS Text

Title: PA44 Instructor pilot reported that on landing roll aircraft had right brake failure causing aircraft to exit the runway.

Narrative: [We] exited Runway 8 on rollout after normal landing. [I was] advised by student (holds Commercial SEL; MEL Add-on; 1;500 hours; 15 in type) that aircraft brakes were inoperative on right side while attempting a right turn after exiting the runway. Student attempted to complete right turn using differential throttle settings. Aircraft didn't respond and departed the left side of the taxiway at a slow speed and came to a stop in the grass beside the taxiway. No damage or impact with taxiway signage or lighting. Aircraft was taxied at slow speed back onto the taxiway and returned to the hangar where it was submitted for repair by a qualified mechanic. Mechanic advised that the right brake cylinder had an O Ring which had failed allowing the hydraulic fluid to escape and caused the loss of the brake on the right side. Aircraft was repaired and returned to service.

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.

PA44 instructor pilot reported that on landing roll aircraft had right brake failure causing aircraft to exit the runway.