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1957 dodge hydrovac ? brake system

Posted By: RapidRobert

1957 dodge hydrovac ? brake system - 11/05/14 11:40 PM

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).
Posted By: moparsquid

Re: 1957 dodge hydrovac ? brake system - 11/05/14 11:56 PM

is it diesel?
Posted By: Supercuda

Re: 1957 dodge hydrovac ? brake system - 11/06/14 12:30 AM

http://www.stovebolt.com/techtips/bendix/erickson/
Posted By: RapidRobert

Re: 1957 dodge hydrovac ? brake system - 11/06/14 01:20 AM

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

Attached picture 8322630-threequartershotofbus.jpg
Posted By: DDodger

Re: 1957 dodge hydrovac ? brake system - 11/06/14 02:10 AM

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
Posted By: RapidRobert

Re: 1957 dodge hydrovac ? brake system - 11/06/14 02:26 AM

She sent me the pic but I ain't seen it in person yet
Posted By: mikemee1331

Re: 1957 dodge hydrovac ? brake system - 11/06/14 04:28 PM

Quote:

There are fringe benefits at stake .


HaHa!! I so wish I could help bro!
Posted By: RapidRobert

Re: 1957 dodge hydrovac ? brake system - 11/06/14 05:25 PM

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
Posted By: mikemee1331

Re: 1957 dodge hydrovac ? brake system - 11/06/14 06:02 PM

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!
Posted By: RapidRobert

Re: 1957 dodge hydrovac ? brake system - 11/06/14 07:31 PM

I'm sure I could find a use for an extra pair of hands
Posted By: savoy64

Re: 1957 dodge hydrovac ? brake system - 11/06/14 07:45 PM

it may be time to talk her out of the bus-----step back from the bus maam.....
Posted By: RTSrunner

Re: 1957 dodge hydrovac ? brake system - 11/07/14 07:08 AM

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!
Posted By: RTSrunner

Re: 1957 dodge hydrovac ? brake system - 11/07/14 07:10 AM

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?
Posted By: RapidRobert

Re: 1957 dodge hydrovac ? brake system - 11/07/14 09:02 AM

of course
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