As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A HIGH SPEED TAXI SYSTEM CHECK OUT, PILOT EXPERIENCED BRAKE LOCK-UP. THE AMATEUR/EXPERIMENTAL CATEGORY AIRCRAFT SLID OFF RUNWAY WITH MINOR DAMAGE AND NO INJURY TO PILOT. PILOT, WHO ALSO BUILT AIRCRAFT, STATED BRAKE SYSTEM HAD NO DISCREPANCIES NOTED DURING INSPECTION AFTER OCCURRENCE. PILOT ALSO STATED HIGH SPEED TAXIING WAS NOT INTENDED FOR FLIGHT.