RCCrawler Forums

mudhunter · 12-31-2008, 03:18 PM

I went to day to napa and got some 1/4 inch brake line and some of the mapp gas. Not the mapp pro junk but the old kind. And some of there flux coted brazeing rods. It seems that the mapp is just not gettin it hot I held it there for ever it will onley burn the flux off the rods also. do I need the sett up with the reglaters and stuff? Right now I just have the mapp gas bottle with a regler end on it..

wonder squirrel · 12-31-2008, 05:40 PM

You need to try some different brazing rod it sounds like.

Try some Harris Safety Silv rod and get some of there white flux to go with it. It flows nicely and the mapp gas you have is plenty hot enough for it.

nj05nismo · 12-31-2008, 07:01 PM

i would swap to a system that uses mapp and O2...but thats just me...gonna be much hotter and make better joints...

Reflection · 12-31-2008, 07:07 PM

Everyone that I know of that brazes brake line,uses Harris Safety Silv flux paste,regular old Mapp gas and plain steel filler rod. I've even seen some use an old coathanger as a filler rod.

Make sure everything is super clean and bare steel before applying the flux.

Calderwood · 12-31-2008, 08:10 PM

Quote:

Originally Posted by nj05nismo

i would swap to a system that uses mapp and O2...but thats just me...gonna be much hotter and make better joints...

I make joints that require zero finishing with only mapp gas.

tinsoldier · 12-31-2008, 09:06 PM

Sounds like you got some oxy-fuel welding rod (read: mild steel rod), not brazing rod.

edit: plain ole' mapp gas brazes effortlessly for me, no o2 necessary and while cleaning the tubing beforehand makes for a faster/easier/cleaner braze that requires no finishing, you can easily burn the coating off the tubing with the torch before applying flux/brazing rod too.

gr33nlemon · 12-31-2008, 09:41 PM

I've used the same setup you are describing and it worked okay for me. Try preheating your brazing rod before it touches the metal. Thats how I do it, and I've even been able to braze like that with regular old propane. That is if you have the brass rod, not the steel rod like someone else mentioned.

mudhunter · 12-31-2008, 10:06 PM

Let me describe this better. I am onley use to brazeing with and oxy/act(Im not for sure if that is the right thing for it) and with 1/8 brazeing rods use powder flux.
I got the 3/32 rods to day the small ones. with the white coted flux. All the rod would do to day is melt the flux off and turn the rod black. I am thinking it might be something with my tip. Cause I tryed the colthanger and it got really hot but my brake line would't get hot enouf. I just used a old bet up tip I am thinkin I need to get a new tip.

Robbob · 01-01-2009, 07:58 AM

Pics? there shouldnt be any reason the brake line isnt getting hot enough as long as you got flame.

it sounds like the rod and/or flux is wrong.

gas · 01-01-2009, 10:23 AM

whats the brake line laying on or clamp to if its touching metal it will apsorpe the heat

frsttimer · 01-01-2009, 02:22 PM

i think you are right you might need a new tip if its a propain tip it will not burn hot enough it needs to be mapp

thatguy · 01-02-2009, 09:33 PM

outside air temp will also cause problems.got back from the k yesterday. had a hell of a time brazing the brake line on the yard truck.had to use a cutting torch to get it hot enough.mapp wont hang when its cold as hell out. was the rod gold color before it turned black?

mudhunter · 01-03-2009, 09:03 AM

yea its prolly my tip. Im now goin to use solid rod. Due to I have no brake line bender and it is much easyer to work with.

12-31-2008, 03:18 PM	#1
mudhunter Pebble Pounder Join Date: Feb 2006 Location: the race track Posts: 198	Why is this not working for me?? I went to day to napa and got some 1/4 inch brake line and some of the mapp gas. Not the mapp pro junk but the old kind. And some of there flux coted brazeing rods. It seems that the mapp is just not gettin it hot I held it there for ever it will onley burn the flux off the rods also. do I need the sett up with the reglaters and stuff? Right now I just have the mapp gas bottle with a regler end on it..

12-31-2008, 09:06 PM	#6
tinsoldier Newbie Join Date: Mar 2008 Location: Portland Posts: 31	Sounds like you got some oxy-fuel welding rod (read: mild steel rod), not brazing rod. edit: plain ole' mapp gas brazes effortlessly for me, no o2 necessary and while cleaning the tubing beforehand makes for a faster/easier/cleaner braze that requires no finishing, you can easily burn the coating off the tubing with the torch before applying flux/brazing rod too. Last edited by tinsoldier; 12-31-2008 at 09:08 PM.

01-02-2009, 09:33 PM	#12
thatguy Quarry Creeper Join Date: Jul 2005 Location: pleasant ridge Posts: 317	outside air temp will also cause problems.got back from the k yesterday. had a hell of a time brazing the brake line on the yard truck.had to use a cutting torch to get it hot enough.mapp wont hang when its cold as hell out. was the rod gold color before it turned black? Last edited by thatguy; 01-02-2009 at 09:37 PM.

12-31-2008, 05:40 PM	#2
wonder squirrel Rock Crawler Join Date: Jul 2005 Location: Central Coast Posts: 667	You need to try some different brazing rod it sounds like. Try some Harris Safety Silv rod and get some of there white flux to go with it. It flows nicely and the mapp gas you have is plenty hot enough for it.

12-31-2008, 07:01 PM	#3
nj05nismo Rock Crawler Join Date: Sep 2007 Location: University City Posts: 627	i would swap to a system that uses mapp and O2...but thats just me...gonna be much hotter and make better joints...

12-31-2008, 07:07 PM	#4
Reflection TEAM MODERATOR Join Date: May 2004 Location: Tennessee Posts: 10,855	Everyone that I know of that brazes brake line,uses Harris Safety Silv flux paste,regular old Mapp gas and plain steel filler rod. I've even seen some use an old coathanger as a filler rod. Make sure everything is super clean and bare steel before applying the flux.

12-31-2008, 09:41 PM	#7
gr33nlemon Quarry Creeper Join Date: Nov 2006 Location: Manchester Posts: 249	I've used the same setup you are describing and it worked okay for me. Try preheating your brazing rod before it touches the metal. Thats how I do it, and I've even been able to braze like that with regular old propane. That is if you have the brass rod, not the steel rod like someone else mentioned.

12-31-2008, 10:06 PM	#8
mudhunter Pebble Pounder Join Date: Feb 2006 Location: the race track Posts: 198	Let me describe this better. I am onley use to brazeing with and oxy/act(Im not for sure if that is the right thing for it) and with 1/8 brazeing rods use powder flux. I got the 3/32 rods to day the small ones. with the white coted flux. All the rod would do to day is melt the flux off and turn the rod black. I am thinking it might be something with my tip. Cause I tryed the colthanger and it got really hot but my brake line would't get hot enouf. I just used a old bet up tip I am thinkin I need to get a new tip.

01-01-2009, 07:58 AM	#9
Robbob Custom Carbon Fiber Join Date: Oct 2007 Location: Connecticut :( Posts: 4,501	Pics? there shouldnt be any reason the brake line isnt getting hot enough as long as you got flame. it sounds like the rod and/or flux is wrong.

01-01-2009, 10:23 AM	#10
gas Rock Stacker Join Date: Sep 2007 Location: east mich Posts: 49	whats the brake line laying on or clamp to if its touching metal it will apsorpe the heat

01-01-2009, 02:22 PM	#11
frsttimer Quarry Creeper Join Date: Nov 2007 Location: barre Posts: 238	i think you are right you might need a new tip if its a propain tip it will not burn hot enough it needs to be mapp

01-03-2009, 09:03 AM	#13
mudhunter Pebble Pounder Join Date: Feb 2006 Location: the race track Posts: 198	yea its prolly my tip. Im now goin to use solid rod. Due to I have no brake line bender and it is much easyer to work with.

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