Narrative:

At approximately xa:40am local time december 2010; while taxiing and preparing to hold short of runway 34 at ZZZ; the pilot became aware of an unusual response to the steering and braking inputs to the aircraft. The pilot was able to stop the aircraft; but not before the nose of the airplane had crossed the hold-short line at the approach end of runway 34. The airplane came to a stop directly over the hold-short line; with the nose on the runway side of the line and the tail on the taxiway side of the line. The pilot immediately notified the ATC ground controller of the situation. The controller then assisted in arranging for an aircraft tow vehicle to push the airplane back behind the hold-short line for runway 34. This occurred without incident. After completing the pre-takeoff checks; the pilot noticed that the aircraft still would not taxi or brake properly. The pilot then asked for and received an ATC clearance to taxi back to the local fixed based operator (FBO) for an inspection into the cause of the problem. This was accomplished without further incident. Maintenance subsequently found that because of the very cold temperatures that morning; an amount of condensation moisture had frozen in the lower brake lines; thereby preventing the brakes from operating properly and preventing the airplane from being stopped on schedule; before reaching the previously mentioned runway hold-short line.the problem was corrected; and the aircraft then operated normally and without incident.

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Original NASA ASRS Text

Title: A corporate pilot reports having steering and braking controllability problems with his Cessna C421 aircraft during taxi out that contributed to a runway incursion in 15 degree Fahrenheit temperature. In a warm hangar; Maintenance noticed a 2.5 to 3 inch long stick of milky; white ice squirt out of the left flexible brake line near the brake caliper.

Narrative: At approximately XA:40am local time December 2010; while taxiing and preparing to hold short of Runway 34 at ZZZ; the Pilot became aware of an unusual response to the steering and braking inputs to the aircraft. The Pilot was able to stop the aircraft; but not before the nose of the airplane had crossed the Hold-Short Line at the approach end of Runway 34. The airplane came to a stop directly over the Hold-Short Line; with the nose on the runway side of the line and the tail on the taxiway side of the line. The Pilot immediately notified the ATC Ground Controller of the situation. The Controller then assisted in arranging for an aircraft tow vehicle to push the airplane back behind the Hold-Short Line for Runway 34. This occurred without incident. After completing the Pre-takeoff Checks; the Pilot noticed that the aircraft still would not taxi or brake properly. The Pilot then asked for and received an ATC clearance to taxi back to the local Fixed Based Operator (FBO) for an Inspection into the cause of the problem. This was accomplished without further incident. Maintenance subsequently found that because of the very cold temperatures that morning; an amount of condensation moisture had frozen in the lower brake lines; thereby preventing the brakes from operating properly and preventing the airplane from being stopped on schedule; before reaching the previously mentioned runway Hold-Short Line.The problem was corrected; and the aircraft then operated normally and without incident.

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.