986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Very scary knocking sound from back of the car

rene525d · 08-27-2012, 11:49 AM

Are you sure its from the wheel? A failing serpentine belt can be intermittent and causes a knocking noise as it will be slipping on and off the pulleys. I suggest you have a look at the belt. Generally it fails around 60k miles.

08-27-2012, 11:49 AM	#4
rene525d Registered User Join Date: Aug 2011 Location: Malta Posts: 144	Are you sure its from the wheel? A failing serpentine belt can be intermittent and causes a knocking noise as it will be slipping on and off the pulleys. I suggest you have a look at the belt. Generally it fails around 60k miles.