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Interesting post you made here?
You seem to know it takes vacuum to operate the brake booster.
You know the booster makes applying the foot pressure easier.
You know where the booster gets it vacuum from.
Are you asking, How do I test the hose and its check valve?
The setup sucks the air out of the booster can, that's a given.
If the hose is not a good sealed conduit it won't empty the booster can.
The check valve allows flow only one way. You suck or blow in only a one way direction.
On the side of the check valve, if you suck on it it should hold that vacuum between the disc and your tongue.
The rubber grommet must also seal around it. Must be free of cracks and soft enough to be pliable and fit well enough to seal.
So basically, you pull this assembly out and get personal with it! You might want to wipe off the part and your lips, so you don't cross contaminate while having the affair. (:-0) (:-)
Just so you know, the check valves do and will fail.
They can fall apart as the plastic housings body or face cracks. The very front of the body is a sealing plate. The outer seam cracks and upon inspection it may even wiggle.
Now that's on a really dried out unit but the "hose" is saying, "Look at us please!"
Good news!
These parts are made cheaply and luckily they are still that way on the retail side.
If these check out to still be working without leaking you might be looking at replacing the big booster can. Sometimes, this leads to a hissing sound heard, in the cabin, when applying those brakes.
Windows up and radio off! (:)
You did not mention if the engine idle speed as being rough or changes.
Phil
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