I have a 2012 Jeep Wrangler and I've experienced something very scary three times in the past couple of years.
I was driving up to an intersection and put my foot on the brake and the brake pedal went completely to the floor with zero braking applied. I immediately pulled my foot back and pressed again and the brakes worked perfectly.
The first time this happened ~year ago and I thought maybe I just imagined it, but it happened again two times in the past few months.
The really bizarre thing is that after these incidents the brakes work perfectly. There is no play in the brakes, I don't need to pump the brakes like there is air in the line. It really appears to be a one off problem.
I looked online and found several things people proposed as the problem:
- bad master cylinder
- bad brake booster
- air bubble in abs system
The master cylinder seems unlikely because the brakes work perfectly after each incident. If the brake booster were having problems, I would imagine that instead of the pedal going to the floor it would be really hard to press and I would still have some breaking power. I don't think the ABS system engaged, so I don't see how it could be the bubble either.
Based on these, I suspect maybe it is some random problem with the ABS system? I have had random instances since I bought the car where the ABS error light will start blinking on and off while driving.
I checked the brake fluid levels and it is somewhere between min and max. I haven't had to top it off since I can remember, so I don't think I'm losing fluid.
Any ideas on what could be causing this issue?