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Need help on my 34 brake vacuum valve
Just can't stay away
Joined:
2012/2/18 7:23
From Port Orange, FL.
Posts: 89
Can not find a breakdown on my vacuum valve. I assumed it had a rubber diaphragm but when I took if apart it looks like a piston or disc operated.
I would think the piston would come out but it is frozen, got it soaking overnight and will try tomorrow to got it out. I also donít quite understand the gasket or seal also. Would love to see a breakdown if anyone has one.
Dave hope you can help, I am sure you took yours apart on your 34......

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Posted on: 12/5 14:31:33
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1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Victoria
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Re: Need help on my 34 brake vacuum valve
Forum Ambassador
Joined:
2007/3/14 16:01
From New Jersey
Posts: 16164
The original diaphragm was a specialized paper, kind of pinkish/orange in tint. It was very long-lived, mine was still in excellent shape as of a few years ago but I did choose to replace it with a rubber one from C&E.

I had exploded views of the internals that I got from Bendix (who bought the business from Bragg/Kliesrath) back in the 60s but haven't seen it in years, not sure I'll be able to find it. You might ask C&E for a sketch.

Do I assume your valve was not functioning? That is, you got the same amount of boost regardless of the amount of boost you selected?

And you do have boost? That is, the other vacuum valve, the one on the pedal linkage, is functioning along with the vacuum piston/cylinder? Note it too uses a paper diaphragm, also available from C&E.

Posted on: 12/5 15:44:41
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Re: Need help on my 34 brake vacuum valve
Home away from home
Joined:
2009/9/14 15:46
From Salt Lake City, UT
Posts: 410

Posted on: 12/5 16:50:04
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Re: Need help on my 34 brake vacuum valve
Just can't stay away
Joined:
2012/2/18 7:23
From Port Orange, FL.
Posts: 89
Dave,
This thing was completely froze up, the previous owner had the vacuum plugged. I pulled a vacuum on the vacuum cylinder and it moved, so I assume it is good. Going to make a new diaphragm out of rubber. I have been driving with no boost, it stopped but you had to push real hard on the petal. Attached is a photo of the diaphragm I am going to copy. Thanks for your help.

Richard

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Posted on: 12/5 17:01:25
_________________
1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Victoria
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Re: Need help on my 34 brake vacuum valve
Just can't stay away
Joined:
2012/2/18 7:23
From Port Orange, FL.
Posts: 89
Thanks Barry, that sure helps, and thanks again for the other.

Posted on: 12/5 17:07:36
_________________
1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Victoria
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Re: Need help on my 34 brake vacuum valve
Just can't stay away
Joined:
2012/2/18 7:23
From Port Orange, FL.
Posts: 89
Dave,
How does the Vacuum Control Assembly work? Does it regulate the amount of vacuum, is it adjustable? I assume the selector switch inside controls something.

Posted on: 12/5 17:24:57
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1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Victoria
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Re: Need help on my 34 brake vacuum valve
Forum Ambassador
Joined:
2007/3/14 16:01
From New Jersey
Posts: 16164
It's briefly described in the owner's manual, as I remember the 4 positions are 25, 50, 75 and 100% application of boost. IIRC at max the unit is providing something like 600# of force on the brake linkage. You're a tough guy to drive that car without the booster, I'd consider it close to an absolute essential for safe driving.

Posted on: 12/5 17:34:44
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Re: Need help on my 34 brake vacuum valve
Just can't stay away
Joined:
2012/2/18 7:23
From Port Orange, FL.
Posts: 89
I got it, made a new diaphragm for the booster valve and control assembly, pulled a vacuum on the booster cylinder, it was good. Started it up still vacuum leak, started at the engine and worked my way back and found out the original 1934 vacuum hoses were leaking. Replaced all hoses, started it
up, no leaks, drove it around the block and what a difference it makes, will stop on a dime and leave change.
Thanks to Dave and Barry for all the information.

Richard

Posted on: 12/7 13:35:25
_________________
1930 Packard 734 Speedster Sedan
1932 Packard 900 Light Eight Sedan
1934 Packard 1101 2/4 Coupe
1932 Packard 903 Victoria
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