Brake fitting question...

NotMatt · Oct 3, 2007

Alright... so pretty soon here I'm going to probably have to do a revamp of my braking system in the YJ. First off, I'm running all the stock brake hard lines that came with it, rust and all, and now the rear hard line is leaking right at the coupling for the soft line. This winter I'm going to tear things apart and do new hard lines throughout, and also plumb in some line locks at the same time.

What I need to know is this... should I stick with the same size tubing as the factory, or should I go bigger? I'm planning on doing a rear disc conversion on my D44 as well as an upgrade to a master cylinder with a little more oomph. Also, what are the stock fittings used on the YJ called? I've always referred to them as a 3/8" "swivel" brakeline fittings, but I'd be interested in knowing how they're measured... is it NPT or AN or what? Somebody have a link to a good guide for this stuff? I always get all these fittings mixed up.

crash2 · Oct 3, 2007

Every rig I have built I have always just used 3/16" hard line.

As for at the master--do you mean the lil adapter thats threaded into the master and then the hardline goes into that?

NotMatt · Oct 3, 2007

crash said:
Every rig I have built I have always just used 3/16" hard line.

As for at the master--do you mean the lil adapter thats threaded into the master and then the hardline goes into that?

No, I guess I wasn't too clear... I'm talking about the flare fittings that go from the hard lines to the soft lines on each side at the front, and at the rear axle. I think most of the flare fittings on the YJ are all the same.

crash2 · Oct 3, 2007

NotMatt said:
No, I guess I wasn't too clear... I'm talking about the flare fittings that go from the hard lines to the soft lines on each side at the front, and at the rear axle. I think most of the flare fittings on the YJ are all the same.

I will have to show ya how I do them matt :awesomework:

CrustyJeep · Oct 3, 2007

Matt, they're called SAE inverted flare I believe. They are a 45 degree double flare design with 3/16" tube. You can buy everything you need at a parts store (including tube in 25-foot rolls), and any hydraulic shop can make high quality custom rubber hoses with the same exact components you'll find on OEM stuff.

I see no reason to go with anything fancy, just get hold of a good flare tool and build everything from scratch from OEM stuff.

On the rear, run you line (or lines, if you do dual rear locks) down your wrap bar. In the front I'd also suggest tossing the two hoses that go from frame to caliper in favor of a single, shorter hose and a T fitting on the axle, like the way the rear is stock.

There is a short little OEM Cadillac hose useful for all four calipers, and a rear CJ hose is good for going from frame to axle because it has a built in T and mounting hold on the end (might be the same as you YJ one).

It's even easy to make the little mounting tabs for the hose ends. 1/8" x 1" strap (or better yet, cold rold 14 guage or so), proper hole, welded on. Buy the little clips in bulk and you're good to go.

If you're at the clean up, take a gander at my setup.

NotMatt · Oct 3, 2007

CrustyJeep said:
If you're at the clean up, take a gander at my setup.

I will definitely be there and will definitely do that. I want to get this all plumbed in so that I can not worry about it down the road. This will include dual rear locks and one for the front. What MC are you running Glen, and are you running rear discs?

I want to keep this simple by using easily available fittings, hoses and tubing, and keeping everything consistent.

CrustyJeep · Oct 3, 2007

NotMatt said:
What MC are you running Glen, and are you running rear discs?

A mid 70' GM 3/4 ton MC. I *think* it's 1.25" bore. Not sure it will fit the later Jeep booster though. Pretty much any larger truck MC should work, just shop by bore diameter; 1-1/8" to 1-1/4" or so.

Definitely rear discs.

Pook · Oct 3, 2007

CrustyJeep said:
Matt, they're called SAE inverted flare I believe. They are a 45 degree double flare design with 3/16" tube. You can buy everything you need at a parts store (including tube in 25-foot rolls), and any hydraulic shop can make high quality custom rubber hoses with the same exact components you'll find on OEM stuff.

I see no reason to go with anything fancy, just get hold of a good flare tool and build everything from scratch from OEM stuff.

On the rear, run you line (or lines, if you do dual rear locks) down your wrap bar. In the front I'd also suggest tossing the two hoses that go from frame to caliper in favor of a single, shorter hose and a T fitting on the axle, like the way the rear is stock.

There is a short little OEM Cadillac hose useful for all four calipers, and a rear CJ hose is good for going from frame to axle because it has a built in T and mounting hold on the end (might be the same as you YJ one).

It's even easy to make the little mounting tabs for the hose ends. 1/8" x 1" strap (or better yet, cold rold 14 guage or so), proper hole, welded on. Buy the little clips in bulk and you're good to go.

If you're at the clean up, take a gander at my setup.

Got any pics or a length on the CJ t'd hose?, I need to redo my brakelines on the ftoy this winter and thats the kind of thing I'm looking for.

CrustyJeep · Oct 3, 2007

Pook said:
Got any pics or a length on the CJ t'd hose?, I need to redo my brakelines on the ftoy this winter and thats the kind of thing I'm looking for.

Neither. Just drop into your local parts store and ask to see a '76 CJ5 rear brake hose. They've always been in stock when I needed one.