Originally Posted by PQ
So, if there is no change when I do that. Then it's NOT the check valve at the brake booster?
I took the hose OFF of the valve at the brake booster and plugged the hose with my finger. It was still missing. So I guess that's the same thing.
Sort of, you were downstream of the check valve so technically it could still be the problem... Crimp it upstream of the valve or remove the valve and plug the line to be sure.