cbjroms Posted April 19, 2014 Share Posted April 19, 2014 I have replaced all of the copper brake pipes on my 13/60 using a Snap On flaring tool to make the 45 degree double flares. I did all the connections up with a spanner and was careful not to over-tighten.Having filled the reservoir and pumped the pedal a few times I notice that the joints to the rubber hoses at front/rear and into the master cylinder are all nice and dry. But most of the joints into the multiple connectors (4 way at front and 3 at rear) were leaking fluid. So I have tightened these a couple of times but don't want to strip the threads.My question is how tight should the male unions be tightened into the multiple connectors? Is there something wrong with the flares if they leak at hand-tight + 180 degrees or should I pull on the spanner as hard as I can?ThanksChris Quote Link to comment Share on other sites More sharing options...
piman Posted April 19, 2014 Share Posted April 19, 2014 Hello Cbjroms, they need to be firm but do not require a huge amount of tightening. Are you sure the fittings match the way your flare has been made as there are two different types, either a hollow flare or a sort of bubble, i.e. the opposite to the flare, like this -{}.Alec Quote Link to comment Share on other sites More sharing options...
cbjroms Posted April 19, 2014 Author Share Posted April 19, 2014 Thanks Alec,Should they not all be double flares?Chris Quote Link to comment Share on other sites More sharing options...
nang Posted April 19, 2014 Share Posted April 19, 2014 Suggest that you anneal the pipe ends by heating them to a dull red and then let them cool. This will soften the ends and will allow the flares to hopefully conform to the unions assuming that you have the correct flares,Tony, Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted April 19, 2014 Share Posted April 19, 2014 No, not all double flares. Most are single - the "sort of bubble" that Alec describes.Nick Quote Link to comment Share on other sites More sharing options...
cbjroms Posted April 19, 2014 Author Share Posted April 19, 2014 Thanks everyone,How can I find out which are singles and which 'bubbles'?Chris Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted April 19, 2014 Share Posted April 19, 2014 IIRC, the only ones which are doubles are the ones that link to the flexihoses. Suggest checking that though as it's 25 ( :o) years since I piped my Herald .........Nick Quote Link to comment Share on other sites More sharing options...
heraldcoupe Posted April 19, 2014 Share Posted April 19, 2014 All male unions have a bubble flare, double flare for the females,Cheers,Bill. Quote Link to comment Share on other sites More sharing options...
piman Posted April 20, 2014 Share Posted April 20, 2014 Hello Chris, just look down the port in the adapter, you'll soon see what shape the pipe end should be.Alec Quote Link to comment Share on other sites More sharing options...
cbjroms Posted April 20, 2014 Author Share Posted April 20, 2014 Thanks again everyone,So I have stupidly made double flares where I should have made bubbles. Never thought to check before I started!Looking around the internet there are many claims/videos suggesting that bubble flares can be made with a double flare tool. Given that we are talking about safety critical items here I don't want to do anything (else!) stupid. So is a bubble flaring tool very different to a double flaring tool?Chris Quote Link to comment Share on other sites More sharing options...
heraldcoupe Posted April 20, 2014 Share Posted April 20, 2014 3459 wrote:Looking around the internet there are many claims/videos suggesting that bubble flares can be made with a double flare tool. Given that we are talking about safety critical items here I don't want to do anything (else!) stupid. So is a bubble flaring tool very different to a double flaring tool?There are two stages. Using the first stage of the tool produces a bubble flare.Following this with the second stage turns it into a double flare with an internal coned profile. There's nothing wrong or unsafe in this, it's how the tools are designed to work,Cheers,Bill. Quote Link to comment Share on other sites More sharing options...
cbjroms Posted April 20, 2014 Author Share Posted April 20, 2014 Thanks Bill,So a bubble flare is the same as a single flare?Chris Quote Link to comment Share on other sites More sharing options...
cbjroms Posted April 20, 2014 Author Share Posted April 20, 2014 Just to make sure that I am on the right track, I have taken a photo of a single and double flare that I have just made.Is the (single) flare on the left the bubble flare that I should be using with the male connectors?ThanksChris Quote Link to comment Share on other sites More sharing options...
piman Posted April 20, 2014 Share Posted April 20, 2014 Hello Chris, it all depends on what they are screwed into, both types are used so that's why I said to look to see what the pipe needs to mate to. The old pipe normally will tell you what it should be.Alec Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted April 20, 2014 Share Posted April 20, 2014 If you mean the one on the right is the single flare, then yes, that is the one that goes next to any externally threaded (male) running nut.NickSee pic (ignore middle image) Quote Link to comment Share on other sites More sharing options...
cbjroms Posted April 20, 2014 Author Share Posted April 20, 2014 Thanks guys,I now understand. By the way, couldn't copy old as I chucked it away when I stripped the car.Chris Quote Link to comment Share on other sites More sharing options...
cbjroms Posted April 20, 2014 Author Share Posted April 20, 2014 Thanks guys,I now understand. By the way, couldn't copy old as I chucked it away when I stripped the car.Chris Quote Link to comment Share on other sites More sharing options...
Talkwrench Posted April 21, 2014 Share Posted April 21, 2014 I just feel into this trap when fitting a brake booster. I to just had some 45 degree double flares made and...fail. I pulled it apart and sure enough looks like the taper in the booster ( and master cylinders) are for a single flare bubble, I'm thinking it should be ISO bubble. I'll get it sorted tomorrow. Quote Link to comment Share on other sites More sharing options...
.thumb.jpeg.b15b81ef10abeea1c3039ae03c4a9f3a.jpeg)
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.