AN ACR B737-100 SUFFERS HYD FAILURE OF BOTH 'A' AND 'B' SYS DURING CLBOUT FROM EWR; NJ.

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AT APPROX XA10 ACFT WAS DISPATCHED AFTER MAINT PERFORMED A CHANGE OF #2 ENG 'A' HYD PUMP. IT WAS COMMUNICATED BY MAINT PERSONNEL THE SUBJECT ACFT WAS AIR-RETURNED THE PREVIOUS DAY BECAUSE OF HYD PROBS. NO WRITE-UPS WERE IN ACFT LOG. WE LOST #2 ENG 'A' HYD PUMP AFTER ENG START AND PULLED BACK IN TO THE GATE. ACFT DISPATCHED AGAIN AFTER #2 ENG 'A' HYD PUMP SOLENOID VALVE 'WIRED OPEN' AND PLACARDED ACCORDINGLY (MEL). ACFT DISPATCHED AGAIN. AFTER TKOF AND APPROX 15 MINS INTO FLT AT APPROX YA05; #2 ENG 'A' HYD PUMP LOW PRESSURE LIGHT ILLUMINATED INDICATING 'A' PUMP FAILURE. APPROX 3 MINS LATER; ALL HYD FLUID WAS LOST DISABLING BOTH 'A' AND 'B' HYD SYS. PERFORMED LOSS OF 'A' HYD SYS; AND LOSS OF BOTH 'A' AND 'B' HYD SYS EMER CHKLISTS AND RETURNED TO EWR FOR EMER LNDG. CABIN PREPARED AND FLT ATTENDANTS BRIEFED. PERFORMED FLAPS 15 DEG LNDG AT 93650 LBS AND STOPPED ACFT ON RWY 22L DUE TO LOSS OF NOSEWHEEL STEERING. ACFT TOWED TO GATE; AND IMMEDIATELY TAKEN OTS. STRONGLY SUSPECT OLDER B737- 100/200 ACFT ARE NOT BEING ADEQUATELY MAINTAINED BY ACR MAINT. ACFT WAS HASTILY DISPATCHED IN THE INTEREST OF MAINTAINING SCHEDULE; WHEN KNOWN DEFECTS AND QUESTIONABLE MAINT PROCS WERE PERFORMED. THIS IS BUT ONE OF NUMEROUS INCIDENTS I'VE PERSONALLY BEEN INVOLVED IN WITHIN PAST 25 MONTHS; INCLUDING EVAC OF B737-200 ON JUL/XA/98 IN EWR. MGMNT'S ACTIONS INDICATE DISCRIMINATE BEHAVIOR WHEN QUESTIONS ARISE SURROUNDING ACR MAINT PROCS AND POLICIES. RECOMMEND IMMEDIATE INVESTIGATION OF ACR MAINT PROCS.