I got My Bubble Flaring Kit on eBay; if the SLS uses a Bubble Flare.

Some People have used the Hydralic Repair type Unions pictured on rusted through Brake Lines. Autozone sells them and of couse other places do also.

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84 300D, 82 Volvo 244Gl Diesel

I do not believe this type of fitting would be safe for brake lines...
it's an outside compression fitting, not a flare of any kind...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
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My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

That is correct. I would not recommend using an external compression fitting for line repair. If an SLS patch failed, you'd just make a mess, but it would be downright dangerous on brake lines. Always use the correct flare tool and matching unions!

Click the link below for a great PDF showing the different types of flare (double/SAE vs bubbble/ISO/DIN).

http://www.fedhillusa.com/webnuts/common%20flares6.pdf