C177 pilot reported a loss of control and runway excursion during landing rollout.

Attributes
ACN	1602822
Time
Date	201812
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cardinal 177/177RG
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	VFR
Component
Aircraft Component	Brake System
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 15 Flight Crew Total 1380 Flight Crew Type 900
Events
Anomaly	Aircraft Equipment Problem Less Severe Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway

Narrative:

After landing on runway 6; the plane rolled for about 50 yards then abruptly veered 45 degrees to the left and settled on the grass. The plane was not damaged. There were no injuries and there was no damage to airport equipment. I was able to taxi to parking and inspected each wheel and could find no apparent cause. I then looked at the parking brake handle and noticed that it was slightly pulled out.

Original NASA ASRS Text

Title: C177 pilot reported a loss of control and runway excursion during landing rollout.

Narrative: After landing on Runway 6; the plane rolled for about 50 yards then abruptly veered 45 degrees to the left and settled on the grass. The plane was not damaged. There were no injuries and there was no damage to airport equipment. I was able to taxi to parking and inspected each wheel and could find no apparent cause. I then looked at the parking brake handle and noticed that it was slightly pulled out.

Data retrieved from NASA's ASRS site 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.