Hey everyone. I get this weird thumping/thudding sound when I come to a stop. It sounds like something hard is falling over in the trunk. If you sit in your car and tap the bottom of your foot onto the carpeted floor it will make a similar sound. It doesn’t happen every time I brake to a stop, but it happens mostly when I’m stopping at a light/stop sign. Happens in all drive modes, and whether I come to a complete stop or near stop (Think TX/CA stop). Again, it’s not every time but maybe 30-40% of the stops. I cleaned out my trunk so there’s nothing back there that can fall over. I also made sure the spare tire was fastened down tight and the tools are secured. I’m thinking maybe a suspension component is lose, but not sure which part. Anyone else have this happen or have some ideas to troubleshoot? 2015 IS350 F sport 52k mi.

 

Have you checked the rear brakes yet?
As it only occurs when stopping and, I'm assuming, not when accelerating, the brakes seem like a good first place to start...granted it doesn't happen all the time.

 

Yes it’s only when stopping and intermittent. I haven’t checked the brakes, I had akebono pads installed about a month ago. The thump is the only indication something is going on in the rear, no squealing, grinding, vibration, or shaking. I’ll try to check if anything is loose with the brakes this weekend.