Brake pipes single or double flare
 

Hi

As part of my overhaul of the brake system I am going to split/join the brake pipes at the rear because the 11mm screw heads have been rounded and can no longer be used.

My question is this.

When flaring the pipes it mentions Single and Double flare.

im confused about when to use a single or when to use a double flare.

For example. With the existing pipe remaining on car and suitably splice/cut awaiting flare do i use a single on that end. (I am using a double joiner) here and adding in the replacement pipe. For replacement pipe end which will go into the hose from the caliper do i use double flare? or should i just use double on all the joins (3 joins in total) Pipe to pipe, pipe to hose.

Regards
Buzz

Sorted
 

For male connector it's single flare. For female connector it's double flare.

It got me all confused. Double is the proper way to do it dependant on what type of coupler used. Single shouldn’t be used on brake systems but some argue a male and female connector is fine, personally for the extra 50p that a joiner costs, use one.

This may help and I don’t think the 75 has anything odd - I posted on here another model of car of mine used American and european types leading to much annoyance getting hold of a suitable flaring tool.

http://www.fedhillusa.com/?page=flare

Carl, having made my own new brake lines using a Sykes Picavant Flaremaster 2 (which is out on loan at the moment so I can't check), my recollection is not consistent with what you're saying. I believe that Charles has summarised the situation perfectly:
Simon :}

This is where I said some argue as you are relying on the two flares butting up to one another if you are joining.

Using a coupler the flare butts up to the solid end of the coupler on both sides.

Simon. I had the same flaring tool you mention in your post.

For some reason, which I forget I GAVE IT AWAY to another former English settler over here who promptly moved back to England so I can't even borrow it back if I run into problems on my car.---:duh::duh::duh:

I've just used one of these to make the single flares - simple to use and did a good job.
https://www.ebay.co.uk/itm/362539980485

40 years since I last changed brake lines but at least I have the tool now if I need it again when I'm 100 :¬)

In my experience making flares for my 75's brake lines, they're all bubble/button/DIN/ISO type. Single flares are not robust enough to be used for braking systems and the double/funnel/SAE/American style are much rarer than they once were. As I read it, the European car industry uses the DIN/ISO standard and America is going/has gone there too. A bubble/button/DIN/ISO flare requires only one die to create, whereas the SAE flare needs two, which you'll not need. You can get a DIN/ISO tool for a lower cost than a multi-flaring set. There's lots of great information on-line.



TC

Here's my guide to brake pipe renewal. Both single and double flares are used on the 75/ZT, "double" is so-named because it's a two stage process using two dies. It makes more sense if they are expressed as male and female respectively. Even so, the subject is complex and confusing.

All you need to know about flaring brake pipes! :D

Simon

I've always called them OP1 & OP2 flares :D