Howdy Guys,

2017 Lariat Fx4, 3.5L Ecoboost. 56K miles.

Lately I've had this "thumping" sound, which sounds like its coming from the driver side front area. The sound sometimes happens going slow in a parking lot and occurs once ever revolution of a tire(best way to describe it). When I first start the truck, I don't have any sounds, then I can drive down the street for a mile or two and as I come to a stop, I start to hear it. Also, when I go into reverse the sound goes away. Ive tried replacing the IWE check valve just to see and it didn't do anything, so hoping some here may have a general idea on possible cause. Edit to added the sound is only heard in the cab, can't hear much at all outside.

 

I'd check brake pads. Maybe you got a stuck caliper that is letting the pads have some slop. Just a thought.

 

Give that corner a good lookever. Maybe a loose bolt. Shock bolt or end link bar bolt perhaps.

 

Will look them over. Thanks for the responses. The fact the sound disappears in reverse is throwing me.