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knocking noise???

3K views 7 replies 4 participants last post by  alex264sho 
#1 ·
ok guys i have noticed this wierd noise a couple times in the past month. it only happens when i stop the car. it literally sounds like someone is knocking on the back of my car like as if they are knocking on a door of a house. now its not loud, its soft, but noticeable for me and others in the car to hear it.. what can this be?
 
#5 ·
the only other car that i was in and noticed an akward noise would have to be my moms cadillac escalade. when the can senses a different amuount of weight, the truck has an air compressor in the back ( this is factory ) that lifts the truck to support the wieght/ride ratio
 
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