I had 2 fairly exciting experiences that I can remember with gumbo in the breaks. Both involved freezing and thawing gumbo.
First experience was driving on gumbo that was very slick and sticky that ended up completely filling up the wheel wells of the pickup to the point that I was unable to turn the steering wheel any longer. It was just around the freezing mark and although the gumbo on the ground wasn't frozen, I guess it was freezing up once in the wheel wells. I had to use a tire iron to dislodge the gumbo from around the tires so that I could turn the steering wheel. This became a drive about a mile, dislodge frozen gumbo from the wheel wells, drive a mile, repeat. The first time being unable to turn the wheel for sure had the pucker factor going.
Second experience was not as exciting. Just got myself into a spot where I was unable to proceed forward or backward without the pickup wanting to slide into a big ravine the gumbo was so slippery. I was able to wait until it got dark and the gumbo froze back up and the frozen gumbo actually was easy to drive on.