1997 GMC K1500 Sierra SLE 8 Cyl 5.7L
Why do i feel and hear a popping sound when i apply the brakes?
It doesn't do it every time but when i step on the brake peddle while the vehicle is moving i can feel and hear it make a fast pop pop pop pop pop sound until the vehicle comes to a complete stop. Is it possible there is air in the system? I just purchased the truck used and he told me that the wheel cylinders had been replaced so i thought maybe the air was not properly removed from the system after the repair was made.
Most likely, the sound is due to worn suspension or shock / strut bushings. With the brake applied, the truck weight (center of gravity) will shift slightly - to load the suspension and bushings. The sound may also be related to; worn / loose caliper or brake mounting bolts / hardware, or worn wheel bearings (front or rear). Can the sound be localized; coming from the front or rear - from the left or right sides?