B757 CROSSES BREMR 1000 FT LOW DURING CIVET 1 ARR TO RWY 25L ILS AT LAX.

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DURING CIVET 1 ARR; FO WAS HAND-FLYING ACFT USING VNAV COMMANDS. BREMR INTXN HAS XING RESTR AT OR ABOVE 12000 FT. JUST PRIOR TO BREMR; FO RESPONDED TO CDU MESSAGE TO ADD DRAG; INTERPRETING MESSAGE AS NEED TO DSND FASTER. FO EXTENDED SPD BRAKES AND DSNDED BELOW 12000 FT. I NOTED ERROR AT APPROX 11000 FT AND FO INITIATED CORRECTION. I INFORMED APCH CTL WE HAD DROPPED BELOW 12000 FT. HE SAID THERE WAS NO TFC CONFLICT BUT TO MAINTAIN 11000 FT. I HAD BEEN BUSY WITH CHKLIST; PA; TUNING ILS; THE USUAL AND DID NOT TOTALLY FOLLOW PROGRESSION OF ARR. WE DO NOT KNOW WHY CDU COMMANDED REQUIREMENT FOR ADDING DRAG DURING THAT PHASE OF FLT. SUPPLEMENTAL INFO FROM ACN 354719: I WAS THE PF. ON THE CIVET 1 ARR TO LAX I DSNDED BELOW THE 12000 FT OR ABOVE RESTR AT BREMR INTXN WHILE HAND-FLYING THE ARR. ONCE WE REALIZED THE MISTAKE I BEGAN TO CLB BUT THE CAPT CALLED APCH CTL AND WE WERE TOLD THERE WAS NO CONFLICT; DSND TO CROSS BREMR AT 11000 FT OR ABOVE. THE CDU HAD SAID DRAG REQUIRED AND I THOUGHT THAT MEANT WE WERE NOT GOING TO MAKE OUR NEXT XING RESTR SO I CONTINUED THE DSCNT BEFORE VERIFYING THE ALT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS HAND- FLYING THE ACFT. SHE WAS FLYING WITH A NEW CAPT WHO WAS VERY INQUISITIVE ABOUT EVERY ACTION SHE WAS MAKING. HE JUST WAS TRYING TO UNDERSTAND EVERY ASPECT OF MANAGING THE APCH. RPTR WAS USING A DIFFERENT TECHNIQUE OF FLYING THE ACFT; AS SHE WAS DSNDING IN VERT SPD WHICH ALLOWED THE ALTIMETER ALERTER TO BE SET TO LOWEST ALT IN THE APCH. HAD SHE BEEN FLYING IN VNAV SHE WOULD HAVE HAD ALT PROTECTION FOR ALL THE INTERMEDIATE ALTS DURING THE APCH. THE CAPT'S CONSTANT INQUIRY OF EVERY STEP THAT WAS BEING TAKEN BY THE PF TOOK A LOT OF TIME FROM PLANNING FOR A BUSY APCH. RPTR STATED THAT THE CAPT WAS VERY DISTRACTING.