What is this vacuum valve for?

[Ritzy1]

This valve is in the line from the intake manifold to the vacuum wipers. What does it do?

I have converted to electric wipers, so I won't need it for wipers, but I'm wondering if I'd still need it plumbed into the vacuum line for the power disk brakes?

 

[RalphM]

I believe just a check valve. A brake booster would require a larger line.

 

[40 Deluxe]

That kind of looks like a hydraulic brake valve/switch of some sort, what with the long threads and the washers. What does it look like when you pull the hose off? I doubt that this belongs in that vacuum port.

 

[V8 Bob]

That looks like a check valve, and one is needed for the vacuum brake booster.

 

[RalphM]

Yes one is needed, but in 42 years of working on cars, I have never see one that small for disc brakes. Now may be possible if a vaccuum reservoir is used.

And it does belong there as the 47 I’m working on has the same thing.

 

[Gary in La.]

It is called a windshield wiper silencer by Ford. The vacuum hose to the wiper motor connected to it and also the vacuum tube to the distributor. The long screw in end was where the banjo fitting went with a copper washer on each side to seal.

 

[Bob C]

This is what it should look like.

Bob

 

[Ritzy1]

It is called a windshield wiper silencer by Ford. The vacuum hose to the wiper motor connected to it and also the vacuum tube to the distributor. The long screw in end was where the banjo fitting went with a copper washer on each side to seal.

Indeed that is where the distributor vacuum line attached as well. Interesting that the valve was called a "silencer", I wonder why?

 

[Bruce_MO]

I always thought they were check valves to prevent damage to the wiper motor if the motor backfired

 

[40 Deluxe]

Hmm, I wonder how well the vacuum advance worked when you turned the wipers on?

 

[drolston]

Hmm, I wonder how well the vacuum advance worked when you turned the wipers on?

I have been planning to hook a PCV to that vacuum port on my 59a engine, and wondered if the air flow would disturb operation of the distributor vacuum brake. Then I figured that a properly sized PCV would not pull any more air flow than windshield wipers, and their operation did not seem to affect the spark advance. I have electric wipers now, so the PCV would not add to that vacuum "leak".

Has anybody else plumbed a PCV into that port? If so, what results?

 

[RalphM]

Hmm, I wonder how well the vacuum advance worked when you turned the wipers on?

Not sure about that, but I know on my old 55 Ford I had in High School the wipers would quit when you stomped on the gas.