B757 FLC UNABLE TO COMPLY WITH MIA TWR HOLD SHORT INSTRUCTION AT INTERSECTING RWY DUE TO SPD AND WET RWY CONDITION CAUSING GAR.

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MIA INTL WAS EXPERIENCING HIT AND MISS RAINSHOWER ACTIVITY AND WET RWYS PREVAILED. WE WERE 'CLRED TO LAND RWY 9R' BY THE MIA TWR. TOUCHDOWN WAS WITHIN TOUCHDOWN ZONE AND AUTOBRAKES WERE SELECTED TO 1. WE WERE ROLLING OUT LONG TO TURN OFF AT THE END OF RWY 9R; SO WE COULD TAXI RIGHT INTO THE RAMP. ON ROLLOUT; TWR ASKED US TO TURN L AS WE WERE PASSING TXWY T5. I INFORMED HIM THAT WE WERE UNABLE BECAUSE OF OUR SPD. THEN TWR TOLD US TO HOLD SHORT OF RWY 12. AT THIS TIME WE USED MAX BRAKING COMMENSURATE WITH SAFETY. DUE TO THE WET RWY; OUR BRAKING EFFECTIVENESS WAS REDUCED AND THE NOSE OF THE ACFT CROSSED OVER THE HOLD SHORT LINES FOR RWY 12. WE INFORMED THE TWR THAT WE WERE OVER THE HOLD SHORT LINES. THE AIRPLANE LNDG RWY 12 WAS INSTRUCTED TO GO AROUND. THE REMAINDER OF THE FLT WAS UNEVENTFUL. TWR NEVER ISSUED A LAHSO CLRNC; AND IT IS MY UNDERSTANDING THAT YOU CANNOT CONDUCT LAHSO'S WITH WET RWYS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THE FLC QUICKLY DISCUSSED THAT THEY WOULD ATTEMPT THE HOLD SHORT; BUT BEGAN SKIDDING DUE TO THE WET SURFACE AND BRAKING EFFORT. UNABLE TO STOP SHORT OF THE RWY; THEY ADVISED OF THEIR INCURSION. THE FLC LATER DISCUSSED THE QUESTION OF THE CLRNC; BUT DID NOT CONSIDER IT TO BE A LAHSO CLRNC DUE TO EXISTING WET RWY CONDITIONS.