My '07 Ford Focus started having a spongy brake pedal a week or two ago and it’s becoming a bit of a diagnosis nightmare.
Pads, shoes, and rotors are fine. My mechanic said that sometimes a master cylinder may fail internally, so his best guess was to replace it. Fluid level was fine, and there were no apparent leaks otherwise.
He replaced the master cylinder, replaced my fluid, and bled the system. I drove around with it for a day, but it just feels way too spongy… there’s what feels like too much play before braking starts, and I can squish the pedal down really far (a few inches from the floor). It definitely feels like there’s air in the system somewhere…
I brought it back this morning, and his only thought was to bleed it again — I asked about the ABS because that’s seemingly the only other place that the brake lines feed into, but he said that if there was an ABS problem we’d get an error code (no existing or pending errors). Before bringing it back I did a quick stop test to ensure the ABS was working, and it does tremor with a panic stop.
Any other thoughts on what this could be? We’re all basically at wit’s end trying to diagnosis it.