Lots of brake pedal travel

[KCBronco]

Brake pedal has lots of travel then rear brakes lockup I don't see any leaks but every time I bleed the brakes there is air Any help will be appreciated.

 

[broncnaz]

Does the brake fluid level go down? Id look at the front brakes most likely the issue is there and only the rears are working. You could have a bad MC as well brake fluid could be running down the firewall or a piston seal is just bad and your not getting pressure to the fronts.

 

[Justafordguy]

What year and what brake setup?

 

[69red]

if you have front drums and they are way out of adjustment, that could be the cause.
you can manually adjust the shoes from the bottom of the backing plate -- its an oval hole with a rubber pug in it.

jack the wheel up so you can spin it a bit while you tighten the brake shoes. as soon as I hear a scrape that's usually the right adjustment.

if that fixes it you should really open up the brakes and see why they are not self adjusting.