C172 SUSTAINS UNCHARACTERIZED DAMAGE AFTER EXITING RWY DUE TO BRAKES LOCKING UP ON LANDING.

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I ENTERED THE DOWNWIND FOR L BASE RWY XX. MY FIRST ATTEMPT I INITIATED A GAR DUE TO HIGH ALT AND HIGH AIRSPD. I RE-ENTERED THE DOWNWIND READJUSTING MY ALT AND AIRSPD. I TURNED L BASE AT 80 KTS AND 10 DEGS OF FLAPS. I EXTENDED MY FINAL FROM MY PREVIOUS ATTEMPT TO ALLOW FOR ENOUGH TIME/ROOM FOR DESIRED LNDG. ON LONG FINAL; I WAS AROUND 75 KTS AND 20 DEGS FLAPS. MY GS WAS ACCURATE AND ON SHORT FINAL I WAS AROUND 65-70 KTS AND FULL FLAPS. I TOUCHED DOWN WITH REAR WHEELS ABOUT 200-300 FT DOWN THE RWY AT AROUND 65 KTS. MY NOSEWHEEL MADE CONTACT AND I APPLIED THE BRAKES. THE BRAKES LOCKED UP AND THE PLANE PROCEEDED TO SKID DOWN THE RWY. I LIFTED OFF THE BRAKES MOMENTARILY TO RELEASE AND REAPPLY THEM TO TRY AND ALLEVIATE THE SKID. THE BRAKES WERE STUCK DOWN AND I COULD NOT STOP THE SKID. THE PLANE CONTINUED DOWN THE RWY SLOWING AT A MINIMAL RATE. I WORKED HARD TO MAINTAIN DIRECTION OF THE ACFT. UNFORTUNATELY; THE PLANE DID NOT STOP IN TIME AND OVERRAN THE RWY. AS PIC; I MADE THE DECISION TO STAY ON THE GND; AND NOT INITIATE A GAR; BECAUSE THERE WAS A LARGE FIELD TO RUN OFF INTO AT THE END OF THE RWY. OTHER REASONS TO AVOID A GAR WOULD BE THE LOCKED BRAKES AND A TREE LINE IN THE DEP PATH THAT MAY HAVE AFFECTED THE AIRSPD/LIFT OF THE AIRPLANE ON DEP. I FEEL THAT THE AIRPLANE WOULD NOT HAVE SUSTAINED DAMAGE IF THE FIELD WAS FREE OF RUTS; BUT 2 DAYS PREVIOUSLY; A TRUCK MADE NUMEROUS RUTS IN THE FIELD CREATING HAZARDS FOR ANY VEHICLE.