Quote Originally Posted by jamesd View Post
I'll be a monkey's uncle! The darn hose does indeed has a check valve built into it. It looks just like a regular hose. No indications that it has anything else in the hose unless you blow in it. Wow.. You are a genius! I'm questioning my skill set now considering this is one thing I had not checked. I was expecting some other external check valve at the booster or intake. Dang... I am hoping this will resolve the issue with P2279. I will install the hose tonight and report back. I will do a vacuum leak test to cover all bases just to be sure.
I too expected an external check valve . Did you try blowing through it ?

If it does indeed have an internal check valve , inside the hose , if you install the hose backwards , you will probably not have any power assist .

Of course , sadly , it also means the booster & master cylinder you replaced were not defective .

God bless
Wyr