Name that Fitting

[Hemi8]

What is this fitting called in the automotive world? They are high pressure lines from a hydraulic pump.

Mike

[andrewb70]

I believe those are called bubble flares.

Andrew

[Hemi8]

I want to replace these hard lines with flexible steel braided PFTE hose, what type of fitting do I need crimped on to the ends to replace these bubble flared tube ends?

Mike

[andrewb70]

I want to replace these hard lines with flexible steel braided PFTE hose, what type of fitting do I need crimped on to the ends to replace these bubble flared tube ends?

Mike

Mike,

You need to find out the size of the thread on those fittings and then get an adapter like this:

https://holley.com/products/plumbing_an_fittings_and_hose/adapters/brake_system_adapters/parts/592032ERL

They you have use flexible hose with AN-3 (or AN-4, depending on the size of the hard lines that you are replacing) fittings.

Andrew

[Hemi8]

Thanks for the help, I think its a 12mm 1.0 thread so I ordered a fitting of this size to test fit.

Mike

[Apogee]

Like Andrew said, ISO metric bubble flare. What size are the lines, 3/16" [4.75mm] or 1/4" [6mm]? They look like 6mm lines if those are M12 nuts, but I believe you can get an adapter fitting to go from M12x1 to -04 AN, which might be your simplest option. We have M10x1 to -03 AN for our brake kits, but nothing like that in an M12.

Tobin
KORE3

[iadr]

Mike,

You need to find out the size of the thread on those fittings and then get an adapter like this:

https://holley.com/products/plumbing_an_fittings_and_hose/adapters/brake_system_adapters/parts/592032ERL

They you have use flexible hose with AN-3 (or AN-4, depending on the size of the hard lines that you are replacing) fittings.

Andrew

Assuming those have the right thread, are you suggesting using them going into (presumably) the caliper using the flare of the fitting to contact the machined female flare seat (where the line's bubble flare contacted), or, with copper crush washers (perhaps with the end of the fitting ground flat/shortened) for an "external" seal location?

[andrewb70]

Assuming those have the right thread, are you suggesting using them going into (presumably) the caliper using the flare of the fitting to contact the machined female flare seat (where the line's bubble flare contacted), or, with copper crush washers (perhaps with the end of the fitting ground flat/shortened) for an "external" seal location?

These fittings seal on the flare/seat, no copper crush washers needed or desired. Crush washers are for banjo fittings.

Andrew

[iadr]

Well, crush washers are not "only" for banjo fittings (used all over divider blocks, ABS pumps etc on the late model stuff, and on my antique British calipers with steel fittings very much like you show), but that's interesting & useful that the flare contact method is a known good solution. It's a fairly much steeper contacter than the bubble flare was.
Works because the fitting it a more rigid material and can handle a "single line" of contact, I guess.