2001 Toyota Sienna - Brake fluid leak

I have break fluid leak from my rear left tire as a result my breaks not working properly.
I believe it is the wheel cylinder. Do you know how much it cost to fix this issue ?

No, but any shop can give you a better estimate to repair your ( Brakes ) then anyone one on the web because we don’t know where you are or what facility you will use .

Also you will probably need a rear brake job because the shoes or pads are contaminated with brake fluid.