AN MD88 FLT CREW EXPERIENCES A LOSS OF BOTH HYD SYS DURING DSCNT FOR AN EMER LNDG AT ELP; TX.

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I SERVED AS CAPT AND PLT IN COMMAND OF FLT ON AUG/TUE/03. I WAS THE PNF. OPS WERE NORMAL UNTIL INTERCEPT TO 12000 FT. PASSING APPROX FL280; PLTS NOTED R HYD LOW PRESS MESSAGE ON ANNUNCIATOR PANEL ACCOMPANIED BY ZERO R HYD PRESS ON COCKPIT INDICATOR. ACCOMPLISHED HYD PRESS LOW CHKLIST RESULTING IN NO RESTORATION OF PRESSURE. ACCOMPLISHED DSCNT CHKLIST STILL RESULTING IN NO RESTORATION OF PRESSURE. WE INFORMED ELP APCH OF OUR PROB; ASKING FOR VECTORS FOR APPROX 20 MINS. I REVIEWED THE R HYD SYS FAILURE CHKLIST WITH FO. DECLARED EMER. ACCOMPLISHED APCH CHKLIST. PASSING 9000 FT MSL; I PUT THE FLAPS TO 15 DEGS; AND WAS PREPARING TO PUT THE GEAR DOWN IN ACCORDANCE WITH THE R HYD FAILURE CHKLIST. NOW WE NOTICED A L HYD PRESSURE LOW MESSAGE ON ANNUNCIATOR PANEL ACCOMPANIED BY ZERO L HYD PRESSURE ON THE COCKPIT INDICATOR. SO; NOW WE HAVE ZERO ON BOTH HYD PRESSURE INDICATORS. HYD QUANTITIES REMAINED NORMAL THROUGHOUT. WE RE-ACCOMPLISHED HYD PRESSURE LOW CHKLIST AGAIN -- THIS TIME; CYCLING THE AUX AND TRANSFER PUMP SWITCHES. BOTH HYD PRESSURES RETURNED TO NORMAL. TECHNICALLY; WE WERE WITHOUT ANY HYD PRESSURE FOR ABOUT 1 MIN; AS I RECALL. LNDG GEAR AND LNDG FLAPS LOWERED NORMALLY. LNDG UNEVENTFUL. FO APPLIED WHEEL BRAKES AT APPROX 110 KTS AND NOTED THE BRAKES FELT MUSHY AND SPONGY; BUT USEABLE. I ASSUMED ACFT CTL AT APPROX 80 KTS; AND I WHOLLY AGREE WITH HIS ASSESSMENT. BRAKE 'FEEL' IMPROVED THE SLOWER WE GOT AND RETURNED TO NORMAL BY THE TIME THAT WE CLRED THE END OF THE RWY. TAXIED SLOWLY TO PARKING. MAINT REMOVED THIS SHIP FROM SVC THE NEXT DAY; DUE TO ITS HYD 'HISTORY.' SUMMARY; R HYD FAILURE NOT RECOVERED WITH CHKLIST. MOMENTARY DUAL HYD FAILURE RECOVERED WITH CHKLIST. UNEVENTFUL OUTCOME.