It's soft rubber and oily/greasy on the inside. No idea why I never noticed it before. No recent work has been done on the vehicle. What is it and where does it go?

Better check, you'll have a rusted and stuck slider if he didn't. That can mean the whole 9-yards, caliper, rotor, pads. Not a good problem to have over a $1.50 rubber boot.Rockhoundrob wrote: ↑Wed Aug 11, 2021 4:43 pmI guess what threw me off is the fact that it is up ON TOP of the engine.
Guess a mechanic put it there while working on the brakes?
Hope, he put on new ones!

