That's the million-dollar question (or at least $874)!!!!!
I bought the Jeep Memorial Day weekend last year. The lift install was done a few months later, in August of 2015. I had no issues with the brakes that I was aware of, except my extended brake line position (getting close to the shocks and a small area where the outer protective of the line got chewed.
Starting in January and going through March of this year, I noticed I would sometimes have a little difficulty shifting 4Hi and then I started having a hard time getting out of "1" into "D" or shifting to higher gears while off-roading. I just figured I was doing something wrong. Eventually it began to happen more frequently, and I was sometimes having to stop and put into P or N first. Then my brake light would start coming on for a short period. First while off-roading, especially when using the e-brake. But then I would notice it would often occur after when I would brake on an incline or a decline. The odd thing was it would not usually not come back on, even with braking on another incline or a decline, if the vehicle did not get turned off.
When the brake light started coming on, I took it to the dealership. After waiting for 3-1/2 hours, I was i formed that they "could not reproduce the problem" ("But did you drive it? take it to an incline or decline? Because I haven't seen the Jeep go out?......"Yeah, No, we didn't take it for a test drive....but that's the information the technician gave me.") and that the computer was "not giving any codes." "Just bring it back to us if it happens again, and you will have to leave it overnight."
Of course, leaving the dealership, the brake light comes on. Brought it back a couple of days later. "Probably something with the sensor -- the computer thinks the brakes are on, so it won't let you change gears." Later: "We checked everything out...." (I don't know if that included the actual brakes/calipers -- Imdid ask them to check the brakes and e-brake, because I was concerned about failure while off-roading, since that was when the light first started coming on.). "We couldn't find anything, but it must be the sensor, so we did some adjustments. Bring it back if it happens again."
And, of course, the light was back on in the morning. This was now right before my trip to Moab for EJS, so with fingers crossed I headed to Utah. While in Moab, I got a "Change Oil Soon" message. Thought to myself: "would 1500 more miles still be considered 'soon?'" Question got answered a couple of days later, with a new "change oil now" message. Went to an oil change place in town (super, super awesome!!! Those guys really new their rigs; badass rigs were pulling in left and right; one guy had his sleeping daughter in his rig on the station and my Dobe was in mine in the next station; allowed to walk all over the place; etc., etc.). Checked all my fluids and changed what needed to be changed. "Hey, would you mind checking my brake fluid for me? I'm sure it's fine, because I have had it checked dealer's a couple of times, but I keep getting a Brake light error." "Oh, yeah, it's pretty low....let me add a little for you." Magic!!![emoji95] No more light.
Sorry for the long answer! But any insight anyone can provide would be great. Just seems lime such a critical bolt shouldn't be so easy to fall out. Really, I don't know how I was so fortunate that the bolt fell out while I was exiting, that no one was around me to be hit, and that I was close to civilization. Less than a minute earlier, I was doing 85 with semis, trailers, and cars all around.