1957 dodge hydrovac ? brake system
#1694886
11/05/14 07:40 PM
11/05/14 07:40 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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57 dodge school bus with this system. A woman has it & there's a brake issue. I believe she said "hydrovac". What is this system & how does it operate. There are fringe benefits at stake  . Thank you for your time (& help).
live every 24 hour block of time like it's your last day on earth
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Re: 1957 dodge hydrovac ? brake system
[Re: Supercuda]
#1694889
11/05/14 09:20 PM
11/05/14 09:20 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
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I do not know if it is a diesel or not but I'm thinking not but I ain't sure. SC thank you for the (informative) link. I'll go thru/study it. EDIT Pic added
Last edited by RapidRobert; 11/05/14 09:41 PM.
live every 24 hour block of time like it's your last day on earth
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Re: 1957 dodge hydrovac ? brake system
[Re: DDodger]
#1694891
11/05/14 10:26 PM
11/05/14 10:26 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
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She sent me the pic but I ain't seen it in person yet
live every 24 hour block of time like it's your last day on earth
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Re: 1957 dodge hydrovac ? brake system
[Re: RapidRobert]
#1694892
11/06/14 12:28 PM
11/06/14 12:28 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
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bethlehem pa
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Quote:
There are fringe benefits at stake .
HaHa!! I so wish I could help bro!
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Re: 1957 dodge hydrovac ? brake system
[Re: RapidRobert]
#1694894
11/06/14 02:02 PM
11/06/14 02:02 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
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Posts: 4,154
bethlehem pa
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Quote:
Quote:
HaHa!! I so wish I could help bro!
Well maybe you can. Are you up for a road trip? You may end up taking a wrong turn
Ha! i'm sure between the 2 of us we could make a complete mess of a brake system neither of us ever heard of! it'll be a Fred Flintstone bus! 
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Re: 1957 dodge hydrovac ? brake system
[Re: mikemee1331]
#1694895
11/06/14 03:31 PM
11/06/14 03:31 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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I'm sure I could find a use for an extra pair of hands
live every 24 hour block of time like it's your last day on earth
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Re: 1957 dodge hydrovac ? brake system
[Re: DDodger]
#1694897
11/07/14 03:08 AM
11/07/14 03:08 AM
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Posts: 1,881
Pittsburgh,PA
RTSrunner
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Pittsburgh,PA
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Quote:
If it looks like the link provided, "Hydrovac" is indeed what it is. They are simple, really. Think of it as a power brake unit. The unit has a brake line going IN from the original master, which activates the unit in place of a push rod. The vacuum boosts it, and feeds boosted pressure out
These were used and added to many older trucks, even pickups
This allows the smaller foot operated master cylinder to operate the large capacity master with reasonable foot pressure.Basically like a hydraulic clutch works,minus the vacuum assist!On the smaller trucks I think it may have been done for space issues too as the vac booster is remotely mounted on the frame and out of the engine compartment.My '69 L600 is like this,but I don't like the single pot master supplying the booster!
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Re: 1957 dodge hydrovac ? brake system
[Re: RapidRobert]
#1694898
11/07/14 03:10 AM
11/07/14 03:10 AM
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Joined: Nov 2003
Posts: 1,881
Pittsburgh,PA
RTSrunner
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Pittsburgh,PA
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Quote:
She sent me the pic but I ain't seen it in person yet
By "it" you are referring to the brake booster ,yes? 
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