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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Need input on removing stock brake lines



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      08-06-2017, 09:42 PM   #1
wren57
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Need input on removing stock brake lines

I am using a flare nut wrench and turning the 11mm nut - problem is the hard line is trying to turn with it. No amount of PB blaster or SeaFoam penetrator will stop this from happening. Already snapped one hard line (part 34326853500 - front drivers side). Any idea what I'm doing wrong?
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      08-06-2017, 10:10 PM   #2
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The hard line should be able to be held with another wrench at the connection point. One wrench on each side, rubber line and hard line.
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      08-07-2017, 06:27 AM   #3
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Quote:
Originally Posted by LMB335IS View Post
The hard line should be able to be held with another wrench at the connection point. One wrench on each side, rubber line and hard line.
Yeah dont trust the indexed hole in the bracket. Use a spanner and hold the square on the female fitting of the rubber hose and an 11mm flare spanner if you have one should shift the union nut easily. Unless your car has a lot of rust?
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      08-09-2017, 09:59 PM   #4
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Whenever I turn the 11mm nut with my flare nut wrench the whole line turns. The 14mm side doesn't turn at all as the bracket holds it. I managed to remove the other front by taking the bracket off and turning the side with the rubber on. Now I'm stuck on the back ones as there is no way to remove the bracket there. The hard lines are turning with the 11mm on them as well. Never again buying a northern car!
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      08-09-2017, 10:05 PM   #5
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Two wrenches are a must as well as penetrating oil and often torch. Brake fluid is very corrosive so even southern car can experience this issue. There are no rules really.
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      08-09-2017, 10:08 PM   #6
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Two wrenches are a must as well as penetrating oil and often torch. Brake fluid is very corrosive so even southern car can experience this issue. There are no rules really.
The second wrench never comes into play because the nut never gets loose enough for that side to turn. But yes I will use one once I get there. I always forget I have a torch... will have to try that.
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      08-10-2017, 02:50 AM   #7
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If you're replacing rubber lines, do yourself a favor and cut the rubber and use a box end wrench.
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      08-10-2017, 04:02 AM   #8
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Cutting the hose won't fix his problem though. His problem is the union nut is twisting the hard line with the nut, as if they were welded together. OP might have no choice but to replace the hardlines. Could try turning it clockwise to try and shock the thing apart but sometimes they are just seized
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      08-11-2017, 10:52 PM   #9
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You can create your own brake line or fix it with a patch kit. If you have a bubble flair kit and some poly steel brake line, you can make your own steel brake line. They do make patch kits for steel brake lines.

As far as getting the lines off, they can be a B@tch. Two wrenches, Kroil oil soaking over night and a torch with yellow bottle.

I'd try Kroil oil first; soak it overnight.

If not, use the torch. Blast it 6-7 seconds. Try and break it loose. If not, repeat 4 to 5 times until it does.

Heat is an amazing thing
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