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1994.5 - 1997 7.3L Power Stroke Diesel  

How much suck??

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Old Mar 2, 2017 | 05:29 PM
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How much suck??

Evening fellas, my brakes have gone hard, and I'm suspecting it is the vacuum pump. I'll put a vacuum gauge on it. How much suck should I be looking for?

Great quote from the movie Fubar... "you got the suck **** cranked! Turn down the suck, turn up the good!"
 
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Old Mar 2, 2017 | 05:44 PM
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I believe it's about 18-20 inches of vacuum.

Check the lines going to and from the vacuum pump
and then check the lines at the manifold where they split off for cracks.
 
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Old Mar 2, 2017 | 06:14 PM
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If I check the vacuum right at the brake booster should I get the same numbers? Or, do we loose some suction somewhere?
 
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Old Mar 2, 2017 | 06:26 PM
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Should be nearly the same at the booster as at the pump; the HVAC should bleed off negligible vacuum. If it's considerably lower at the booster than at the pump, I'd say you have a leak.
 
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Old Mar 2, 2017 | 08:12 PM
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If the pump fails your vent controls will suffer as well. If they still work then you may have a brake issue instead of a vac pump issue
 
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Old Mar 2, 2017 | 08:28 PM
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Thanks men, heading out to the shop to test her out now. It's been so freakin' cold here the vents never move off windshield defrost! -28c here tonight! That converts to, like, really cold in Fahrenheit!
 
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Old Mar 2, 2017 | 09:08 PM
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^^^^ I believe that converts to Insane degrees below Friggin'.....
 
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Old Mar 2, 2017 | 09:10 PM
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Where do you live? In a deep freezer?
 
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Old Mar 2, 2017 | 11:05 PM
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I live in god's country, Kenora Ontario Canada, just a really cold god right now...

So, the vac pump is porked. She make's zero suck.

The next question is, does a wise man just buy a new pump and carry on. OR... does a wiser, more complicated man change things?? Say, electric vacuum pump, or some other type of super-mod setup?

Also, a little fun fact. The vents seemed to change positions, even with the line right off the vacuum pump? Does this make sense?
 
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Old Mar 3, 2017 | 12:02 AM
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No electric pump can run the booster. You'd have to go to hydroboost brakes, then get an e-pump for the HVAC. Doable, but not cheap or easy.

No surprise about the HVAC working; it takes VERY little vacuum compared to the brake booster.
 
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Old Mar 3, 2017 | 12:07 AM
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You could get rid of the vacuum pump and run a hydro boost setup like found in the super dutys. Unless you tow heavy daily I don't personally think it's worth it.

I bought a replacement A1 cardone vacuum pump from amazon about 8 months ago now from amazon. It's been working awesome. Was about $100 shipped.

As for your vents changing if you unplug the vacuum from them as the pressure changes it could be actuating them.
 
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Old Mar 5, 2017 | 08:26 AM
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Originally Posted by muskydawg
Thanks men, heading out to the shop to test her out now. It's been so freakin' cold here the vents never move off windshield defrost! -28c here tonight! That converts to, like, really cold in Fahrenheit!
that is the quote of the day!
 
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