Apply heat to brake line fitting,yes or no?

[srv1]

I picked up some new ft. brake hoses.I cannot get the hard lines to break free from the end that attaches to the old brake hose.So my question is,can I apply heat to those fittings without damaging anything or is there possibly another method to get these lines off?

 

[Fast69Mopar]

I picked up some new ft. brake hoses.I cannot get the hard lines to break free from the end that attaches to the old brake hose.So my question is,can I apply heat to those fittings without damaging anything or is there possibly another method to get these lines off?

Yes, you can apply heat as long as it is a directed heat source like from a fine tip torch. I use a small butane torch that I have for soldering wires. It has a very fine flame and doesn't spread over a large area.

Soak the fitting with a rust penetrant for a while and then apply the heat.

 

[srv1]

Thank you.I have been soaking with penetrant I just wanted to make sure there was not any o rings or seals in the hard line fitting that could be damaged.I have a standard propane torch I was going to use,will that work?I was also thinking about picking up some map gas as I've heard it burns hotter than propane,do you know if this is true?I'm assuming by you recc. a fine tip torch I want to keep the flame off the hard line and heat the hard line fitting and the metal part of the brake hose where it connects,correct?

 

[Travelin Ram]

A few hundred degrees, yes. Cherry red, no, if it’s a part you’re reusing.

In addition to penetrating oil, a technique I have used with good results is heat the fitting, then spray the joint concentrating on the inner fitting with penetrating oil. The oil will rapidly cool and shrink the fitting and help break the seal between the threads and suck oil in.
Obviously caution is required because if you don’t know what you’re doing -> fire.

 

[GTyankee]

Invest in a good Penetrating Fluid, like PB BLASTER or KROIL, the gun oil

WD-40 is not a Penetrant, WD stands for Water Displacement, the 40 stands for the 40th Formula that they tried before it worked

 

[seagiant]

Hi,
Kroil is the best, but $$$!

PB Blaster is good and easily available.

A regular propane torch will work fine.

Just try to be safe, the heat will do it and wetting it with water after heating will still "shock" it and is free!

 

[Bob Macknight]

try to tighten it just a smudge, then try to loosen

 

[GTyankee]

I don't work with Copper, Brass or small diameter tube steel much

I forgot about the first tighten, then loosen method

It is the method that you would use to clean, chase or cut threads & using cutting oil & tap & die tools