[AlanBDahl]

(Originally posted in the autocross section, reposted here as I still have no idea what happened)

This weekend I swapped my wheels for the first time for Sunday’s autocross and I used the exact same jack points with my floor jack I had used on my SES when I rotated tires, on the pinch weld in the area that appeared to be the most reenforced, about 4-6” from the wheel well. Both times when lowering the rear wheels I heard a loud pop but I could not figure out if the sound came from the jack, the fiberglass rocker panel or somewhere else. Has this happened to anyone else? Am I perhaps not using the wrong jack points?

 

[Jeff]

The pop came from the parking/e brake dragging the pad along the rotor. You shifted the weight of the car, moved the wheel assembly, and put it back down. Perfectly normal.

 

[AlanBDahl]

Thanks! That's the first explanation I've heard that makes sense and I'm happy to hear that I didn't damage anything.

 

[BRGT350]

The pop is from the jack getting caught up on the side skirts. There is a very small window of room to get the jack or even a lift to make contact with the pinch weld and not catch the side skirt. I had this all the time with the Fiesta Movement ST. I could see the skirt being pushed up towards the door, then the pop, and skirt would drop back to normal location. Keep an eye on the skirts when you jack it up.

 

[ST-in-Mich]

The pop is from the jack getting caught up on the side skirts. There is a very small window of room to get the jack or even a lift to make contact with the pinch weld and not catch the side skirt. I had this all the time with the Fiesta Movement ST. I could see the skirt being pushed up towards the door, then the pop, and skirt would drop back to normal location. Keep an eye on the skirts when you jack it up.

I thought that it could have been the skirts, but when i jacked up mine to change my oil i got under there and made sure to clear them. But when i lowered it back down when i was done there was still a popping noise, not loud but certainly enough for me to notice.