`99 S10 Blazer noise

[Old Paint]

Not sure if this is the right area for this question. I have a `99 S10 Blazer with the 4.3 V6. There is a noise like a howling vacuum cleaner coming from the hose that runs from the manifold to the brake booster. I`m wondering if there is some kind of valve in that fitting or just what I will find when I pull this apart. Anyone ever experience this problem ? Thanks

[leegreen]

sounds like a vacuum leak, hose or fitting is loose, cracked badly

[HO455]

Originally Posted by leegreen

sounds like a vacuum leak, hose or fitting is loose, cracked badly

I'd say the same. My 91 had a hose develop a hole on the underside that made a similar noise. The hose looked good from above but until I ran my fingers down the hose with the engine running I didn't know what the issue was. The hose simply had a 1/4 inch spot that rotted away.