I have an older Ford Explorer and it sat for a while. I went to drive it in the snow and the brake pedal went to the floor as I backed out. In looking, it left a line of fluid on the ground. I parked it and it sat for 2-3 more months until I had time to deal with it. The rear metal line was corroded. I bought a new line, replaced it, bled the brakes and had no pedal at all. Worked on it for a while, on and off, bleeding over and over and over. Still no pedal. Figured the calipers were seized up anyway, so bought new hydraulic lines and new calipers and pads. Installed new hydraulic lines, new calipers, new pads, bled the brakes about 5 or more times. No pedal. Well, I say no pedal, but which the truck off, I get pedal, as soon as start it, the pedal goes all the way to the floor and I literally don't have any brakes, other than the friction on the pads themselves.
Figured it was only two real pieces left, the master cylinder and the brake booster, and it's my understanding that the brake booster just makes the pedal easier to push, so I put a new master cylinder on. Bench bled it, installed it, still no brakes.
I have one of those pressurized canisters that you put on the master cylinder and it allows you to bleed the brakes by yourself and really well, and when that's hooked up, I'm not losing any pressure on the top side of things. No air appears to be coming out. I've pushed about 2-3 quarts of fluid through it all and still, no brakes.
I've asked a number of people a lot smarter than me about it and everyone seems to be stumped. I've googled over and over and have yet to find a solution.
Could I just be missing an air pocket somewhere? Wouldn't I at least have some pedal?
Any ideas?