What was found
UPON BRAKE APP PRIOR TO MLG RETRACTION, FO HEARD A THUD. RETRACTED MLG NOTICED RT HYD IND ON CWP PRIOR TO ACCELERATION ALT. OBSERVED FALLING IND & HYD QTY GAUGE & 0 PRESSURE ON MAIN SYS PRESS GAUGE. CONTINUED TO CLIMB TO 2000 MSL. NORMAL EXTENSION FAILED. CONTACTED TOWER & ADVISED OF SITUATION. PERFORMED CLIMB CKS. REQUESTED VECTORS BACK TO SDF. PERFORMED 'LOSS OF CONTENTS' EMERGENCY CKLIST. REQUESTED A BOX BACK AROUND TO DISCUSS PROCEDURES FOR NO FLAP LANDING W/OUT BRAKES OR NWS. COMPLETED ALL CKS. APPROACH & LANDING WERE NORM. PROBLEM MEL'D IAW MEL 32-3. MEL 32-3 CLEARED ON 4/23/2004, NLG UPLINE HOSE R & R IAW SD3-60 MM. GEAR SWING OPS CK GOOD. LEAK CK GOOD. A/C RETURNED TO SERVICE. (M)