47-59 DOT 5.0 brake fluid question

[TX3100Guy]

I installed an all new set of calipers, rotors, and an electric hydraulic pump (frame mounted) on my 1953 truck a while ago. But if you've followed my other thread, I've had to deal with an engine rebuild and most recently a magneto rebuild/issue.

In any case, i've begun to button up other small tasks in getting ready to get the truck on the road for engine break in and testing all my other changes. Today I noticed a fine mist of DOT 5.0 brake fluid (what the mfg of the brake system recommended) on the passenger side front frame rail, just below the remote reservoir. A few weeks back, I had noticed the same fine mist on that same frame rail and deck of the four post lift just under that section of the frame. I was too occupied with other issues at the time, so I just wiped it up.

Today, I tried to figure out where this spray of DOT 5.0 is coming from. Lucky for me, DOT 5.0 is synthetic and doesn't remove paint, otherwise my epoxy shop floor would be a total mess. In my search, I noticed that two of the remote filler hoses that move the brake fluid to the master cylinder (also frame mounted) appear to be "sweating" brake fluid. The brake kit didn't come with enough filler hose to span the length from the passenger side remote reservoir to the drivers side master cylinder and hydraulic pump, so I bought brake line hose of the same diameter from O'Reilly's and it appears that those are the hoses that are sweating fluid, both at the hose clamp ends and along a partial section of the hose.

Am I imaging things? Does the synthetic brake fluid (DOT 5.0) require a different kind of hose?

[Hcb3200]

Did you buy bulk hose as in he cut it for you? Or was it specific packaged.

I have gone into a shop before asked for 4 feet of this and that and have not gotten what I expected.

Can you post the hose details lettering or picture.

If its sweeting wipe it down with a white clean cloth and confirm color fluid type.

I got fooled by some condensation before i thought was a overnight slow leak. lol. Just saying.

[TX3100Guy]

Originally Posted by Hcb3200

Did you buy bulk hose as in he cut it for you? Or was it specific packaged.

I have gone into a shop before asked for 4 feet of this and that and have not gotten what I expected.

Can you post the hose details lettering or picture.

If its sweeting wipe it down with a white clean cloth and confirm color fluid type.

I got fooled by some condensation before i thought was a overnight slow leak. lol. Just saying.

The hose has no part number marking. All it says alongs its length is "Replace every five years 070722". which I think is its manufacturing date. I purchased a 25 ft length and still have ten feet sitting right next to me.

Each hose clamp on both ends of the two sections I used are weeping the brake fluid. The hose provided by the mfg, does not. The mfg just told me that it is power steering hose made of ethyl propylene. I have found power steering hose online, but its doesn't say what its made of.

[Hcb3200]

That makes sense

EPDM (ethylene propylene diene monomer) is approved for brake fluid and is what you are looking for. Unless you know for sure that bulk hose is this flavor then I would confirm by looking at the reel it came off. Or by a 25ft roll off of online store confirming the hose type.

[TX3100Guy]

Originally Posted by Hcb3200

That makes sense

EPDM (ethylene propylene diene monomer) is approved for brake fluid and is what you are looking for. Unless you know for sure that bulk hose is this flavor then I would confirm by looking at the reel it came off. Or by a 25ft roll off of online store confirming the hose type.

From another auto project, I have a long length of Gate 4219BG Fuel Hose of the correct ID. I wonder if it would work? I can't find any info on what type of compound its made of.

[Hcb3200]

Fuel hose is normally not compatible as brake hose or power steering.
I would not use that.

[TX3100Guy]

Originally Posted by Hcb3200

Fuel hose is normally not compatible as brake hose or power steering.
I would not use that.

Thanks, that's what I thought, but wanted to get another opinion. I just ordered some fairly expensive power steering hose. It will be here alter this week and I'll get it cut and installed shortly.