Noisy jolt when backing up

[azred]

I made the following report to Tesla this morning, but previous experience isn't very reassuring that they will take the report seriously. Maybe someone here knows what's going on?? "This morning when we started to back out of our garage we got a severe, noisy jolt. My wife got out of the passenger seat and looked behind the car to see if we had hit something, but that was not the case. We then drove the car with no further incident. Is it safe to continue driving the car?" (FYI I did give Tesla more info to help check our logs like I turned on emergency flashers briefly at the time of occurrence, but I get the impression they get so many trouble reports that only the most severe are addressed which is why I am soliciting info on this forum. Our 2016 S is only two months old so obviously we have little experience with what others may write off as minor firmware bugs)

 

[Kutu]

If after a hard rain (or washing the car), I drive into my garage and park for a couple of days I get a hard bump. I think it is from the brake pads sticking. Happened often with my Model S, doesn't seem to happen with the Model X.

 

[mspohr]

I made the following report to Tesla this morning, but previous experience isn't very reassuring that they will take the report seriously. Maybe someone here knows what's going on?? "This morning when we started to back out of our garage we got a severe, noisy jolt. My wife got out of the passenger seat and looked behind the car to see if we had hit something, but that was not the case. We then drove the car with no further incident. Is it safe to continue driving the car?" (FYI I did give Tesla more info to help check our logs like I turned on emergency flashers briefly at the time of occurrence, but I get the impression they get so many trouble reports that only the most severe are addressed which is why I am soliciting info on this forum. Our 2016 S is only two months old so obviously we have little experience with what others may write off as minor firmware bugs)

It occasionally happens that the rear calipers stick. This can happen more often when the calipers are wet. When you put the car in Park, it locks the second set of rear calipers to the disc. If they are wet or dirty or rusty, they may stick when you go to release them and drive the next day. The noise and jolt is caused by them unsticking suddenly. This happens fairly frequently to my car this winter now that there is more moisture, snow, etc.
This is not a problem. It is "normal". Keep calm and carry on.

 

[azred]

Interesting re the possibly sticking brakes. I did wash the car Sunday afternoon and then put it in the garage -- and didn't drive it until this morning. Thanks for the help. Sounds like there is probably no issue.

 

[wiredprairie]

It's happened quite a few times to our S after driving home in rain or through snowy/slushy conditions (or washing the car), the next morning when we're backing out we'll hear the loud bump, thump noise.