A FOKKER 100 AT FL200 DECLARED AN EMER DUE TO LOSS OF #2 HYD SYS ON DSCNT EXPERIENCED LOSS OF #1 HYD SYS. ON LNDG WITH NO REVERSERS; NOSE GEAR STEERING AND BRAKES HAD RWY EXCURSION.

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DSNDING INTO SBN; WE RECEIVED MULTIPLE MFDS ADVISORIES AND ASSOCIATED FAULT LIGHTS INDICATING THAT THE #2 HYD SYS HAD FAILED. ALL APPROPRIATE MFDS AND QRH PROCS WERE COMPLETED. SHORTLY THEREAFTER; THE MFDS DISPLAYED MULTIPLE ADVISORIES AND ASSOCIATED FAULT LIGHTS INDICATING A #1 HYD SYS FAILURE. ALL APPROPRIATE MFDS AND QRH PROCS WERE COMPLETED. ATC WAS NOTIFIED AND AN EMER DECLARED. WE REQUESTED THAT THE EMER EQUIP STAND BY. WE LANDED ON RWY 27L. ACCUMULATOR BRAKING WAS INITIALLY ADEQUATE (NO THRUST REVERSERS OR NOSEWHEEL STEERING); HOWEVER; WELL INTO THE ROLLOUT (AIRSPD GREATER THAN 80 KTS) THE ACFT BEGAN TO VEER L OF CTR. R BRAKE WAS OF NO AFFECT (PEDAL WENT FULL TRAVEL). L BRAKE WAS USED TO STOP THE ACFT CAUSING THE L MAIN AND NOSEWHEEL TO DEPART THE RWY. R MAIN REMAINED WITH ACFT STOPPING APPROX 1500 FT SHORT OF THE END. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FAILURE OF #2 HYD SYS WAS AN INCORRECT O-RING SEAL IN THE #2 ENG DRIVEN HYD PUMP. THE RPTR SAID THE LOSS OF #1 SYS PRESSURE AND QUANTITY WAS CAUSED BY AN ANTI-SKID SHUTTLE VALVE THAT FAILED. CALLBACK CONVERSATION WITH RPTR ACN 437865 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE #2 FLUID LOSS WAS FROM THE #2 ENG DRIVEN PUMP WHICH HAD FAILED. THE RPTR SAID HE HAD NO DETAILS ON THE CAUSE OF #1 SYS FAILURE.