mazda cx9 brake booster is bad ?

Hey all.
When slowing down the cx9,I feel the brake pedal will not return to its original position after being pressed.
Have you ever experienced this issue and if the mazda cx9 brake booster is bad ?
I was wondering if this mazda cx 9 brake booster replacement would work on a 08 mazda cx-9 ?
Any help would be greatly appreciated
I just replaced my booster on my 13, my issue was much more noticeable when reversing. It wasn't so much the pedal not returning, but it just wouldn't stop.

Do your brakes work ok/better while the car is at speed vs from a stop/parked/low speed?

I'd check your brake fluid too. Low fluid could affect the position of your pedal, as well as amount of wear on your pads.