Bake Fluid Leaking somewhere

What is your question?

The rear passenger tire was full of brake fluid. I cleaned and replaced brake caliber Bled the brakes and brakes were working fine for a little while .went to the store and the gas station then my brakes stopped working I stopped and looked in the reservoir for break fluid was empty.No obvious signs of brake fluid leaking anywhere

How long has your 2001 Toyota Tundra had this problem?

ACouple weeks