What was found
BRAKES, AUTO BRAKE FAULT A SECOND TIME. LOST NORMAL BRAKING. HAD TO USE ACT BRAKING. DURING BRAKING THE ACFT JOLTED FWD. LOST BRAKES FOR 1-2 SECS, GRABBING AGAIN. DID NOT PULL TO EITHER SIDE. TROUBLESHOT IAW TSM 32-42-00-810-849-A. WHEN ACFT ARRIVED AT GATE, BSCU 1 GROUND SCANNING REPORT & LRU WIRING & BSCU TEST & NORM BRAKE TEST ALL FAULT SELECTOR VALVE (23GG)/LG HYD PIPE. NO LEAKS FOUND ON GREEN HYD SYS. RESERVOIR LVL OK. HYD BRAKE FILTER (2584GM) HAS NO CLOGGING INDICATION. STEP 4.A.(3) OF TSM REQ. R & R OF BRAKE SELECTOR VALVE (23GG) IAW AMM 32-42. PERFORMED BSCU SYSTEM TEST WITH NO DISCREPANCIES NOTED. (LP: 8574828)