ACDelco 15823207 GM Original Equipment Power Brake Booster Vacuum Check Valve Kit with Check Valves and Grommet

Like a charm

This part fixed my vaccum sound and brake issues.I was hearing a vacuum noise when turning off the vehicle. I would also hear the same noise when loading the engine (while going down the highway), letting off the gas for a second or two then putting a load on the engine again. if i ever had the hit the brakes hard while a load on the engine, the brake pedal would be rock hard until after about a second or two. this part fixed that problem.To test if your valve is bad, remove it from the vehicle and try to blow air through it both ways. you should only be able to blow air through it from one direction. i spent more time cleaning than the actual installation. installation is a breeze and takes less than a minute.Installed on a 2008 Silverado but would fit other fullsize GM models.

Don’t skimp out for a non-OEM, get an ACDelco and save yourself a headache. Brand new booster and master cylinder and the mechanic used a non-OEM unit that leaked. Hard pedal with no assist with the engine off is due to a leaking check valve. Stuck this on with the new grommet, used a shot of silicone spray to make it easier and now I have power brake assist with engine off.

Made in China crap. It is NOT universal. Wouldn't fit 2006 chevy Silverado, as it stated it would.

Used on a ls swap for brake booster.