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Vacuum brakes? How does that work?

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Old Jul 8, 2018 | 06:29 PM
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From: Vidalia onion,GA
Vacuum brakes? How does that work?

My '72 f500 has vacuum assist brakes.
the one that has the massive canister under the running board and a single chamber master cylinder piped into it.
how do they work?
how hard are they to find parts for and work with?

the trucks been sitting for ten years, the master is seized, the vent tube running into the cab from the booster is shot. I don't know what else is going to be wrong and what even could be. Never heard of, seen, or worked on anything like it.
 
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Old Jul 9, 2018 | 12:03 AM
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Video is a Chevy, but all makes used the hydro-vac booster system from Bendix and other makers.

 
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Old Jul 9, 2018 | 12:04 AM
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Parts and rebuilt units are available. Just need to find out what model booster you have.
 
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Old Jul 9, 2018 | 11:03 PM
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From: Vidalia onion,GA
Very educational video... Anyone know how to figure out which model it is? Am I looking in a particular spot for a tag or cast number of will some pictures help?
 
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Old Jul 9, 2018 | 11:04 PM
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Thanks, very educational video. Not so scared of them anymore.
Anyone know how to figure out which model it is? Am I looking in a particular spot for a tag or cast number of will some pictures help?
 
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Old Jul 9, 2018 | 11:42 PM
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This guy shows medium truck boosters, not sure how far and wide his service net is. But his site has lots of into with pictures which may get you closer to an ID for your booster:

Ed Strain Inc. - Power Brake Booster Rebuild

I've seen Numberdummy check the parts books for hydrovac info, maybe he will cruise by your thread--wait, maybe he has an old post:

Like this, with the links in post 2 giving the info for your year truck. Second link in post 1 is of value, and the rest is background for the most part:

https://www.ford-trucks.com/forums/1...ke-system.html
 
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Old Jul 10, 2018 | 07:13 AM
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From: Vidalia onion,GA
Bendix 2510065. Thanks guys. That's a pretty good thread
 
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Old Sep 7, 2018 | 04:46 PM
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If your brake booster in a "hydro vac" you should put a charcoal filter on the vacuum line as the gas fumes will get to the rubber diaphragm and cause it to fail.
If it has failed, do not rebuild it. buy a new later year one as the rebuild parts use old OEM parts and they only last a year.
I went thru two before I bought a new one.
I bought mine from,
Midwest Power Products.
1 815 942 0550
$445. Part # 374980N
 
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