I heard some vehicles used a check valve inline in the hose going to the booster for the power brakes, but I'm not doing well trying to find one. Anyone know what make and year had them? I've heard from a few people that F*rd used them, but what F*rd I don't know. I found a real small one Dorman makes but besides it's small size, it's brand new and doesn't work, I can blow air through it both ways.
Thanks in advance!