2nd Gen Non-Engine/Transmission Brake pedal will go hard on 2nd press

[KRStone]

If I depress the brake pedal, let up, and then depress it again very soon, it will sometimes go hard.



So, I tried the tests to verify the booster, and it passed.



I'm wondering if the booster check ball is bad?



Is it possible this symptom would be a bad booster valve?



This is not to be confused with my other post about the vacuum pump check ball; I am looking to replace all vacuum lines and that question will help me with the vacuum pump.



Thank you for any help you can give,

KRS

 

[LandShark]

Could be the check valve. There was a recall on some of the 2nd gen check valves. In any case, they are cheap and take about a minute to replace.