I original bought this check valve kit to remedy a suspected vacuum leak in the brake booster area of my 2008 Impala LT. I was noticing an audible hissing noise when pressing the brake as well as noticeably reduced braking power. That being said, this item did not fix my issue but it's worth checking out before other parts since it's very affordable.The fix for my vacuum leak came from the plastic/rubber seal within the brake booster itself which is not a part you can purchase by itself. You have to purchase an entire new brake booster or pull the part from a brake booster on a similar model year Impala from an auto salvage yard.This item is slightly bigger than the OEM check valve and a different color (slightly off white/grey). See pictures for packaging and side-by-side comparison of OEM vs this AC Delco check valve.I've attached bonus pics of the original brake booster seal that failed and caused the brake booster to malfunction and the intact one I pulled from a salvaged Impala. Hope this helps!
Item fit perfectly.Excellent service.EP
I installed the Check Valve in 2 minutes and it works great. No more leaks through the rubber seal.