As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI ONTO RUNWAY WITH LT RUDDER DEFLECTION, HEARD & FELT A POP IN THE RUDDER PEDALS & THEN SMELLED A NOXIOUS ODOR. THE LT BRAKE PEDAL HAD NO EFFECT, HAD TO USE EMERGENCY BRAKING TO STOP THE ACFT. AFTER STOPPING THERE WAS A LARGE PUDDLE IN THE FIRST OFFICER'S FLOOR AREA. R & R THE CO-PILOT'S LT BRAKE MASTER CYLINDER & TWO HYD LINES IAW MM 32-42-02. OPS & LEAK CHECKED GOOD.