A flare or line wrench (not sure difference) that wraps around 4 or 5 sides of the bolt is the essential tool. And the smacking it with hammer (hands can get hurt) is the technique just as one poster said. I ruined all but one bolt on the parts car getting them off. I did not have flare wrench.

I replaced 2 rear lines on my car today. The front ones were ok. The ones i put on were date 2-26-00 . . . a little older than i would have guessed. However they looked a hundred times better than the ones i took off. I could see the white braid on the inner tube through the cracks in the ones i took off. With the flare wrench and hammer technique i had no troubles with stipping bolts. Thanks for the tips.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius