[mr0077]

I haven't done this test, but I'd bet that if you hooked up a PCV valve (or if you already have one) and check the vacuum during normal idle and then put your thumb over the end of the valve to seal it off, you wouldn't be able to see the difference on your vacuum gage. If that is so, then a PCV valve wouldn't affect your idle vacuum enough to affect your power brakes. I think I'll check that next time I fiddle with my car...