Brake Line Flares

[Keyav8r]

I'm in the process of installing a '96 dual diaphragm booster in my '88 MJ. The '96 master cylinder has bubble flares on the lines. As I have no clue how to create bubble flares and don't want to buy the tool to do them, I'm going to reuse the old lines at the MC. The lines at the distribution block/proportioning valve look like single flares, could be double flares. (Does anyone know if they are single or doubled flared?)

So, my options are to either cut the existing lines and splice them together with flared unions or make new lines for the block (if they are single flared) and splice them to the MC lines.

Suggestions?

[HOrnbrod]

My suggestion is to buy a decent flaring tool for $20 or so and do it right. You're going to need it again and again down the road.

[1987Comanche]

You can reuse one line but not both as one for the front won't be long enough.  Every line on the brake system is double flared (I've never seen a single flare on any brake line period).  You'll find that the fittings on the XJ/ZJ booster are metric and the MJ proportioning valve is standard.  You'll need to reuse one fitting when you make a longer brake line

 

You can see both lines in my build:

http://comancheclub.com/topic/37173-georgia-92-40-ho-ax-15-2wd/

 

  BTW The double flaring kit is a free loaner tool at Auto Zone & O'Reilly.

[Eagle]

Any taper flared not bubble flared) brake lines are double flared. DO NOT use a single flare for brakes, and DO NOT use compression couplings. Either do it right, and be safe ... or don't do it at all.

[64 Cheyenne]

I used the tool that does the double flare, just did the first stage, same as a bubble flare.
Been in service on the Chief, going on three years now.

[Keyav8r]

My suggestion is to buy a decent flaring tool for $20 or so and do it right. You're going to need it again and again down the road.

Can you get a decent double flare tool for $20? Where?

You can reuse one line but not both as one for the front won't be long enough.  Every line on the brake system is double flared (I've never seen a single flare on any brake line period).  You'll find that the fittings on the XJ/ZJ booster are metric and the MJ proportioning valve is standard.  You'll need to reuse one fitting when you make a longer brake line

 

You can see both lines in my build:

http://comancheclub.com/topic/37173-georgia-92-40-ho-ax-15-2wd/

 

  BTW The double flaring kit is a free loaner tool at Auto Zone & O'Reilly.

Yeah, I noticed the bubble flare fittings on the MC are metric and different sizes (I guess so you can't cross connect) and the fittings on the block are standard (and now know they're double flares). Guess I'll make another pass at the P&P for some more lines to cannabalize.

 

I

Any taper flared not bubble flared) brake lines are double flared. DO NOT use a single flare for brakes, and DO NOT use compression couplings. Either do it right, and be safe ... or don't do it at all.

Whatever I do it will be flared, not compression. Not going to intentionally endanger others or myself.

[64 Cheyenne]

First off, making proper flares aint always easy.

Suggest you practice on a scrap of tube before you do the one for the money.

Main thing I learned with the cheap tool was to get rid of the wing nuts, tighten the nut closest to the

flair first, then the farthest, makes for a good tight hold.

Make sure the depth is proper, and make sure the body of the tool is flush with the other side.

This is the tool I use:

 

http://www.harborfreight.com/double-tube-flaring-tool-kit-66534.html

 

Take a look at this video:

 

[Keyav8r]

Thanks for the video. Looks like the bubble flare isn't as hard to do as I thought it would be. I believe I'll pick up some new tubing and fab up a set of lines. Need to replace my LF line from the block to the rubber hose, also.

[64 Cheyenne]

Just don't forget to put the fitting on the line before you flare it...ask me how I know.

[jimoshel]

Just don't forget to put the fitting on the line before you flare it...ask me how I know.

College education, $50K up. Experience, priceless.