I've got an 05 Burban...my kid was driving the truck and only hit a " PUDDLE" while driving in the rain...Brake Light came on..Traction control came on..and the pedal is down to the floor with master empty... I get it in the garage fill master pump it up...no visual leaks..Fronts bleed out fine pedal still to the floor..I get a code reader and it's pulling a C0131 ABS brake TCS Brake..System pressure check malfunction..C0035 LEFT FRONT WHEEL SPEED SENSOR..C0455 Steering Wheel Position sensor malfunction ..musta been a helluva puddle..I'm going to replace the left front sensor because I need to replace the slider pins for the caliper anyway..any reasonable guesses to whether I should replace the master or go right to the ABS Module?? I'm leaning to Master Cylinder but hoping for some insight from someone a little more mechanical..