H E L P!!!
Brakes are fine right after they are bled. Then the pedal becomes spongy
and with each successive brake application the pedal travels further to the
floor until there is little hydraulic pressure and the car barely stops and
then they have to be bled again. There are no fluid leaks and the lines are
full of air. I am at a loss to explain it. I had to replace the rear wheel
brake cylinders because the bleed valves were broken. This occurs within 5
to 10 pedal applications. The emergency brake is properly adjusted and
fully functional. When you step on the brake pedal you can hear a hiss or
vacuum sound from underneath the dashboard too. :-(
You can email me at email@example.com or Post here. I'd be greatful for any
help anyone can provide!