So I have skipped over many posts titled things like "Horrible Door Rattle" as I never had this issue before. However, after 100 miles in 4wd on snowy, muddy, rocky, bumpy, and steep roads in the Colorado high country over the previous week, my truck developed a rattle coming from what I thought was the lower driver door area. It drove me crazy for a couple hundred miles so I started trying to find the culprit. Turns out it was my emergency brake pedal. The bolt (10mm I think) going through the assembly had come loose and it would rattle over every slight bump. I tightened it up and no more rattle. Thought I'd share in case someone else runs until it.

 

I’ll check my E brake.

My 19 F350 176” SRW has a light rattle resonance sound while stopped in gear.
It sounds like a thin metal shield is loose around the drivers floorboard area ?

i can slightly increase eng rpm & it goes away.

Thanks for your post.

 

Great share!

 

It was easy to tell it was loose when the e brake is off. Just try to move it side to side and see if there's any play. When it was engaged, it had enough tension that you couldn't really move it even though the bolt was loose.

 

heat shield?