Hey I am having problems with my brake pedal periodically going to the floor. It doesn't happen all the time. I have checked the connections to the calipers and don't see any leaks anywhere. After it started happening I have had the brake fluid flushed and bled. It got better for a few days. I have tried pressing the brake pedal with the vehicle off and it builds up pressure and doesn't go soft. I have also tried holding pedal down. And staring it and the brake booster seems to be working ok. After starting it pedal goes down a tiny bit as it should. Not wanting to just throw parts at it. Any thoughts? Its a 2001 Ford F150 V6
@jnarramore
Sounds like a air leak - Seal Or Line
Sounds line air in the system..
Try bleeding again the full system (abs pump, clutch piston- if manual-, and each brake caliper from rear to front). I would recommand using gunson bleed kit, cheap and practical. By the same chance replacing the brake fluid might also help.
Make sure the circuit is sealed before starting, otherwise it won't work.
