As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOOT BRAKES REQUIRE MAXIMUM PRESSURE (STANDING ON THEM TO GET 1500-1600 PSI ON BRAKE PRESSURE GAUGE). BRAKES WILL NOT HOLD AIRCRAFT AT TAKEOFF POWER AND REQUIRE EXCESSIVE PEDAL APPLICATION TO GET BRAKE PRESSURE. UPON INVESIAGATION, MAINTENANCE REPLACED THE LEFT BRAKE ASSEMBLY AND PRESSURE REDUCING VALVE IAW AMM 32-40-17. AIRCRAFT TAXI CHECK GOOD. NO FURTHER PROBLEMS.