Tricks for loosening brake line fittings?

[b5blue]

   Any tricks for getting stuck brake line fittings loose? The lines are not rusty, I'm trying to undo the lines to each front wheel at the hoses so I can do a disk swap. 
They were soaked in PB Blaster for days, today I wire brushed as good as I could and resprayed. I've new lines for the master to distribution block also and the old ones won't budge along with the one to the rear wheels ether. (To install the proportioning adjuster.)   Darn it I'd hoped not to need all new lines!
  Who makes the best Line Wrenches?

[fy469rtse]

Yes brake line fittings are the worst,
Yes look for the ring wrenches , solid thick ends with a slot to fit over steel line, make sure fit is tight , then the only way is one quick firm action to crack them loose,
If it doesn't work, then lock grips to undo ,
Bad part if you have to do this you will have to cut fitting off and replace it , reflaring the end of brake line , remember double flare,
Get those brake line wring spanners , it makes the chances better of getting them undone

[Dmichels]

You HAVE to get the flair nut wrench. Do not try this without one.  You can try a little heat. Worst case you need to replace the line.
Dave

[JB400]

At work, I deal with rusty hoses and fittings all the time.  I was told to take two hammers, and have one up against the fitting, and tap with the other hammer on the opposite side to loosen it up.  Just do it all the way around, (if possible) and it should come loose when you put the wrenches back to it.  I'd also recommend the flaired nut wrench as well.

[charger1972]

At work, I deal with rusty hoses and fittings all the time.  I was told to take two hammers, and have one up against the fitting, and tap with the other hammer on the opposite side to loosen it up.  Just do it all the way around, (if possible) and it should come loose when you put the wrenches back to it.  I'd also recommend the flaired nut wrench as well.

I`m gonna have to try that one . I`v all ways heated the fitting red hot then hit it with water . But seen a guy do it to long and the hose blew apart . Loud bang , smoke , definitely gets your attention .

[StockMan]

Warm erup around the nipple, then hit er with an ice cube, then go to work on er.

[Mopar Nut]

I wished I would have asked first before screwing mine up.   

[b5blue]

  Thanks guys! You've got me thinking outside the box now... I've several makes of line wrenches I'm using. (Not cheap one's ether.) I thought possibly some brand was way better, I'd buy it also. I've got a Harbor Freight Heat gun I can try using. That tiny 3/8th flair nut just has so little mechanical strength.
   I put some water in an old cleaned out Dawn dish soap bottle, in the freezer. I'll let it get really cold and try heating with the gun then shocking with cold water. I may need to get one of the tiny pencil size blow torches also. I can't reach areas to whack with a hammer but may need to if tearing down later.     

[Dodgecharger74]

I use a pair of vise grips on outside of brake line wrench and a little heat   Works most times

[fy469rtse]

.? How did it go ,
Did you get those lines loose

[b5blue]

.? How did it go ,
Did you get those lines loose

  Due to my "situation" with the car I bought all new lines.  I'll only be reusing the brass blocks, hopefully they can be saved.  I'll cut them loose and bench the removal of fittings. The job went from disk swap to complete overhaul, still waiting for my new rear wheel cylinders to start hacking.

[six-tee-nine]

Buy a special wrench for these.

The best money you'll ever spend.

[b5blue]

Buy a special wrench for these.

The best money you'll ever spend.

Where do you get that?

[71 SE3834V]

At work, I deal with rusty hoses and fittings all the time.  I was told to take two hammers, and have one up against the fitting, and tap with the other hammer on the opposite side to loosen it up.  Just do it all the way around, (if possible) and it should come loose when you put the wrenches back to it.  I'd also recommend the flaired nut wrench as well.

I`m gonna have to try that one . I`v all ways heated the fitting red hot then hit it with water . But seen a guy do it to long and the hose blew apart . Loud bang , smoke , definitely gets your attention .

Been there, done that! Brain farts happen.
You need to open the bleeder screw to release the pressure to prevent it from blowing although you still take a chance on melting the hose if you're not quick enough. It usually doesn't need to be red hot to work.

[charger1972]

I cut a hose that was being replaced . Proceeded to heat the fitting to get it to brake loose from the steel line , and it still went bang . Even with the hose cut at the crimp .

[71 SE3834V]

That's really weird!

[71 SE3834V]

That's really weird!

[71 SE3834V]

Possibly the inner layer of the hose had separated and swelled up closing it up??

[charger1972]

I cut it with side-dykes , so could have crimped it shut . Maybe ? Not sure , but it got my attention .

[b5blue]

FYI last parts needed are almost here. (O rings and springs for brake unbalance indicator switch.) I'll be testing "tricks" on parts removed to experiment and report back, my Jeep is getting old and next for brake work.