2010 LEXUS GX Steering Problems

AFTER FEELING THAT MY BRAKES HADN'T WORKED PROPERLY AT A STOP LIGHT (I ALMOST SKID THROUGH IT), I WAS TRAVELING ABOUT 35 MPH AROUND A CURVE AND LIGHTLY PRESSED ON THE BRAKES TO MAKE SURE I WOULD SLOW DOWN. UNBELIEVABLY, MY BRAKES COMPLETELY FAILED AND I ACTUALLY BELIEVE I SPED UP WHILE AT THE SAME TIME MY STEERING WENT OUT OF CONTROL. I WAS UNABLE TO CONTROL OR STOP THE CAR. AFTER A FEW SECONDS I WAS ABLE TO PULL OFF TO THE RIGHT AND MUD SLOWED ME DOWN ENOUGH TO COME TO A STOP. IT WAS A TRULY PETRIFYING EXPERIENCE AND THE TOW TRUCK DRIVER CONFIRMED THAT MY BRAKES WERE COMPLETELY NON-FUNCTIONING WHEN HE HAD TO USE THE EMERGENCY BRAKE TO GET MY CAR ON HIS TRUCK. LEXUS CLAIMED THAT THEY COULD FIND NOTHING WRONG WITH THE CAR, HOWEVER, WHICH I FIND TO BE EXTREMELY DISTURBING. I PRAY THAT...