What was found
(CAN) INSTALLED BRAKE UNIT FRESH FROM OVERHAUL FROM MFG. BLED BRAKE & FOUND BRAKE LOCKED UP AT FIRST BRAKE PRESS APPLICATION. UNABLE TO TURN DISCS UNTIL BOTH HYD & EMER BRAKE LINES WERE LOOSENED. SWAPPED NORMAL & EMER SHUTTLE BETWEEN OLD & NEW BRAKE UNIT TO ENSURE SHUTTLE VLV WASN`T AT FAULT. RE-INSTALLED, BLED & PRESS TESTED OLD BRAKE. SYS OPERATED NORMALLY. RECEIVED & INSTALLED REPLACEMENT OVERHAULED BRAKE. BRAKE SYS OPERATES NORMALLY. RETURNED ACFT TO SERVICE. RETURNED UNSERVICEABLE BRAKE TO MFG FOR TEAR DOWN & REPAIR.