Hey there I have a 2004 4.0 Ford Ranger and I recently changed the front brake pads, and now the pedal is spongy and the brakes feel week, almost as if the new pads aren't even engaging. I bled the brakes in the correct order with a kit that had a very small container for the old fluid to go into so I only pumped the brakes a few times for each wheel, so maybe there's still air in them?? When I press the pedal it goes down a lot further and takes more pressure to stop, and when I start the truck with the brake pedal down it falls an inch or so as it should so no issues there. The only thing I can think of is when I compressed the pistons I didn't remove the cap from the brake fluid tank. Any ideas would be appreciated, thanks! :)
The symptoms you describe are consistent with air in the lines. I suspect your bleeding was inadequate. It's almost always a 2 person job with one pressing on the pedal while the other bleeds the air out and keeps an eye on the reservoir.
For a one person job, use speed bleeders or a vacuum bleeder.
I believe that once your system is properly purged of air the brake sponginess will stop.