DHC8 UNABLE TO RAISE GEAR AT PHL. UPON RETURNING TO LAND DISCOVERS NO HYD BRAKING. WITH GEAR LEVER IN THE DOWN POS AND THE GEAR PINS REMOVED; ACFT OPERATES NORMALLY.

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FLT XYZ ACR PHL-SCE (STATE COLLEGE; PA). DURING GND TIME; MAINT COMPLIED WITH MEL DEALING WITH A 'L STALL WARNING' INDICATION FROM PREVIOUS FLT. ON DEP FROM RWY 35 AT INTXN K; CAPT REQUESTED 'GEAR UP' AND FO COMPLIED. GEAR DID NOT RETRACT. CREW COMPLETED CLB CHKLIST AND LEVELED OFF AT 3500 FT TO RUN ABNORMAL CHKLIST. CREW ADVISED PHL APCH OF GEAR MALFUNCTION AND REQUESTED TIME AT 3500 FT TO COMPLETE CHKLIST. COMPLIED WITH COMPANY APPROVED PROC FOR 'GEAR INDICATOR LIGHTS MALFUNCTION.' CREW COMPLETED CHKLIST AND DETERMINED THE GEAR WAS DOWN AND LOCKED. ADVISED PHL APCH THAT WE WILL BE RETURNING TO LAND AT PHL ARPT. AFTER ADVISING THE FLT ATTENDANT; OPS; AND THE PAX; WE RETURNED TO PHL. DURING VECTORS FOR VISUAL APCH TO RWY 27L; CAPT CALLED FOR ARR CHKLIST; REVIEW ABNORMAL CHKLIST; AND BEFORE LNDG CHKS. APCH AND LNDG WERE NORMAL. DURING LNDG ROLLOUT; CAPT DISCOVERED HE HAD NO NORMAL BRAKING; AND THE NOSEWHEEL STEERING CAUTION LIGHT ILLUMINATED. FO CHKED THE NORMAL BRAKES ON HIS SIDE AND THEY DID NOT WORK. CAPT USED RUDDER PEDALS AND DIFFERENTIAL PWR TO CLR RWY AND USED EMER BRAKE TO STOP AS NECESSARY. SHUT DOWN ON TXWY AND DISCOVERED GEAR HANDLE IN THE UP POS. ALSO; UPON POSTFLT INSPECTION; FOUND GEAR PINS INSTALLED BY MAINT WHICH SHOULD HAVE BEEN REMOVED AFTER MAINT ACTION. GND PERSONNEL ARRIVED AND DEPLANED PAX. MAINT REMOVED GEAR PINS AND CREW TAXIED ACFT BACK TO PARKING. DURING 'BEFORE LNDG CHKLIST' CREW FAILED TO VERIFY THE GEAR HANDLE WAS IN THE DOWN POS WITH THE 3 GREEN GEAR INDICATORS ILLUMINATED. WHILE PERFORMING 'BEFORE LNDG CHKLIST' PNF WAS ALSO WORKING RADIOS AND DID NOT SELECT GEAR HANDLE IN THE DOWN POS. ASSUMPTION WAS MADE AFTER COMPLETING CHKLIST THAT GEAR WAS DOWN AND LOCKED. AS PER COMPANY PROCS CREW DID COMPLETE GENERAL 'WALKAROUND' INSPECTION AFTER MAINT ACTION. AS PER COMPANY PROCS; CREW DID COMPLY WITH CHKLIST PROCS. PNF DID BECOME DISTR WITH SIT AND RADIOS WHEN CHKLIST ITEMS WERE BEING PERFORMED. MAINT DID NOT COMPLY COMPLETELY WITH PROCS FOR MEL OF L STALL WARNING INDICATION; WHICH SET UP THE RETURN TO FIELD.