Bake booster to Vacuum canister hose size.

[Gregg Benedict]

Can anyone tell me the size of the vacuum hose between the brake booster and the vacuum canister, as well as the hose between the manifold and the canister? This is on a 1958 Imperial.

-Gregg B.

 

[CBODY67]

Might there be some faded stamping numbers on the hose themselves?

Just curious,
CBODY67

 

[Gregg Benedict]

Well, unfortunately, the last person used heater hose instead of vacuum hose, so it's not correct to begin with.

 

[lemondana]

Does it take the same size hose as the later stuff? The later uses 11/32" heavy wall brake booster hose.

 

[Gregg Benedict]

Does it take the same size hose as the later stuff? The later uses 11/32" heavy wall brake booster hose.

Maybe... not sure... don't have a later car to compare.

 

[Big_John]

Per the parts manual, Section 5-111-17 11/32"

 

[Gregg Benedict]

Thanks, John. Here is what it looks like now:

 

[CBODY67]

Well, unfortunately, the last person used heater hose instead of vacuum hose, so it's not correct to begin with.

Hoses are measured by the ID rather than OD. ID is what's stamped on them.

 

[Big_John]

Thanks, John. Here is what it looks like now:

View attachment 698294

The 11/32" hose is sometimes hard to come by. I've bought it on Amazon https://www.amazon.com/gp/product/B000CRHL5S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

That 5/8" hose is a bunch larger than the 11/32", so I'm wondering if some one has changed the fittings. Usually you see 3/8" hose (.375" dia.) used in its place. 5/8=.625 and 11/32= .343"

Here's a couple screen shots from the parts manual. Get a copy at https://mymopar.com/?pid=31

 

[Gregg Benedict]

That 5/8" hose is a bunch larger than the 11/32", so I'm wondering if some one has changed the fittings. Usually you see 3/8" hose (.375" dia.) used in its place. 5/8=.625 and 11/32= .343"

I doubt that the fittings were changed, as they would have to make changes to both fittings on the tank, as well as the one on the booster and the intake manifold. I have some 11/32" vacuum hose coming from NAPA today. I'll report back after then.

-Gregg B.

 

[Jakter]

I've bought the correct size brake hose from Napa before.
They didn't have it in stock but was able to order it.

Picking the Proper Vacuum Hose For Your Brake System | Master Power Brakes

 

[moparcuda]

Can anyone tell me the size of the vacuum hose between the brake booster and the vacuum canister, as well as the hose between the manifold and the canister? This is on a 1958 Imperial.

-Gregg B.

On my 57 dodge I have 5/8" hose

 

[Gregg Benedict]

I doubt that the fittings were changed, as they would have to make changes to both fittings on the tank, as well as the one on the booster and the intake manifold. I have some 11/32" vacuum hose coming from NAPA today. I'll report back after then.

-Gregg B.

Well, I got the new hose today. However, I have a hard time believing that this 11/32" hose is correct for this. I tried to get it on the fitting, but it is just too small to fit. This new hose I have is clearly marked as 11/32". I've shown pictures of the 5/8" heater hose that was on there, compared to the new 11/32" hose, and one can see the difference. I also have a photo showing what the new 11/32" hose looks like compared to the fitting.

I'm thinking what I really need is this 15/32" hose, even though the parts book says otherwise. Any concerns or observations:

 

[Big_John]

Well, I got the new hose today. However, I have a hard time believing that this 11/32" hose is correct for this. I tried to get it on the fitting, but it is just too small to fit. This new hose I have is clearly marked as 11/32". I've shown pictures of the 5/8" heater hose that was on there, compared to the new 11/32" hose, and one can see the difference. I also have a photo showing what the new 11/32" hose looks like compared to the fitting.


View attachment 698510


View attachment 698511

I'm thinking what I really need is this 15/32" hose, even though the parts book says otherwise. Any concerns or observations:

View attachment 698512

15/32 = .468". 5/8 = .625" The difference is 5/32" or .156"

So, I don't think that will work. The thing to do is measure your fittings.

 

[Gregg Benedict]

The hose fitting is right around 1/2", give or take 1/32":

 

[Big_John]

The hose fitting is right around 1/2", give or take 1/32":

View attachment 698513

You need to buy a set of calipers. Harbor Freight has some cheap, toss in the toolbox versions for a couple bucks. Better yet, spend about $25 on their 6" digital caliper.

Anyway... 1/2" = .500". That 15/32" (.468") should fit.

 

[Gregg Benedict]

You need to buy a set of calipers. Harbor Freight has some cheap, toss in the toolbox versions for a couple bucks. Better yet, spend about $25 on their 6" digital caliper.

Anyway... 1/2" = .500". That 15/32" (.468") should fit.

I am assuming that going to 11/32" or a 15/32" hose from a 5/8" hose wont affect the amount of vacuum going to the booster. Of course, the 5/8" heater hose on there was already collapsing, so it's got to be better than it was...

 

[lemondana]

I think I have a box of the bigger vacuum hose, let me check tomorrow. I'll just send you a piece, because I know I haven't ever used any of it. I got it a long time ago. And it is the heavy wall hose.