I was afraid of this, a common problem on older Toyotas from the rust belt. The only way to fix this is to order new brake lines from Toyota. There is no way to SAFELY patch a brake line. Go to parts.toyota.com and enter your VIN number and search for brake lines. You need the lines that go from the distribution block mounted on the fire wall to the block mounted above the rear suspension sub frame.
Yep, should have no problem as the flair nut is the part of the brake line assembly that usually causes all of the problems. Ask me how I know Just use a liberal dose of PB blaster penetrating oil and let it sit for a while before you start trying to loosen the flair nuts. You will also need a set of flair nut wrenches to reduce the likelihood of rounding the flair nuts off and making the job a real mother. The only advantage you will have is that you are replacing the lines so you can escalate to a pair of plyers to get them loose if you have to. The flare nut usually rusts and seizes to the brake line and not in the distribution block.
Off topic, but that reminded me of what happened on my very first car, a '62 VW bug. By the time it was over I had replaced the entire brake line system. PITA but I learned a lot in the process. (The first lesson being "Don't buy a rusted out VW Bug"!)I saw the same issue once when I was changing brakes on a friend's car. I got the new pads in, got in the car and pumped the brakes a few times to return the new pads to the rotors and....squish!....one of the brake lines gushed with fluid.
That was my first car too! Lots of push starting with the wonderful 6volt system that never kept the battery charged. Fond memories of the old days.Off topic, but that reminded me of what happened on my very first car, a '62 VW bug. By the time it was over I had replaced the entire brake line system. PITA but I learned a lot in the process. (The first lesson being "Don't buy a rusted out VW Bug"!)
Saw that; however, there is sign of fluid a little towards the front also, just want to verify with OP to see if that was just spray or something else!Check out his pics, they are leaking from under the plastic cover. Lots of corrosion on the part of the lines that you can see.
Look below the master cylinder! You are looking for fluid tracks; look for areas where you see fluid tracks below and none above! Or have someone else press the brake pedal while you check!I didn't see any issue with the master cylinder. Every thing there looked in pretty good shape.