6 replies to this topic

[warning634]

Hi all

I need to know what the standard brake fitting thread is? Apart from fitting a kad bias master cylinders the rest of my braking system is mini based.

And with the mini are most of the brake pipes flared to concaved or the other one (convexed I think)

I'm plumbing my own brake lines, so I need to order the parts, but I'm stumped.

Cheers

Kevin

[Ethel]

You can find either metric or imperial, so it's best if you can tell the differences by looking.

If you say what cylinders etc. you have we can make an informed guess, but I'm sure google will give you some info 'n piccies.
The most likely to confuse are M10x1 & 3/8unf the metric being slightly larger.

Usually male fittings will be convex and female concave.

[warning634]

As for the master cylinders one is girling and the other wilwood. It seems one is a male fitting and the other a female fitting.



How do you tell by looking at a fitting what thread it is? (years of experience)

Thanks

Kevin

[Italianjoblofty]

Hey dude i have just started making my brake lines and most of it is imperial and 3/8 unf. But i do have a dual line brake master cyliner which has M10 and M12 threads. As for the male/female fittings your just going to have to work it out to suite your needs, depends what extras you have ie bias valve, handbrake etc and what ends are required.

Hope that helps :)

[Ethel]

There used to be some good piccies in the Haynes.

Imperial tend to be silver (zinc) and metric gold (chromate) but that's not 100% reliable. There are also differences in shape & how much is threaded.

I'd check with Wilwood to be certain about that master, it could even be something different again as it's made for racing.

http://www.reedx.net...tings/index.htm


ps. where's that clutch master from? Looks just the jobby :)

[warning634]

Hi Ethel

Thanks for the advice, I'm sure that I have an email from kad somewhere which states what the thread is on the master cylinders.

The clutch master, I got that from eBay. It's an ap racing one from a mini, I just need to change the pipe fittings that go to the reservoir from straight to 90". Fingers crossed it all works.

I may raid the old brake lines that I removed from the car and reuse the fittings. At least that may I know that they will fit or buy an assorted set of brake fittings.

Cheers

Kevin

[tiger99]

In a standard Mini, all threads are 3/8" UNF, except if there is a dual circuit master cylinder with two different size ports, which, as has been said, are M10 and M12.

For the Willwood cylinder, check the part number and look at their web site.

Two things to beware of, firstly 3/8" and M10 fittings can be improperly mixed, and may feel ok, as you might think that you are sqieezing the flare, which does take some reasonable amount of torque. However, you are actually partially stripping the thred, and it WILL fail, usually quite soon. So take care! The UNF thread looks much finer than M10 visually. You can always try a bare tube nut in teh fitting with your fingers. It ought to screw all the way in, without being forced, if it is correct.

Secondly, be aware that Willwood stuff is of US origin, and many things are named differently. It is likely to be a UNF thread, but feel the sealing face with something soft like a cocktail stick to see whether it is concave, for a single flare, or convex, for a double flare. Some types of fitting used in the US may not be legal in the UK, but if the Willwood was procured for road use from a reputable supplier in the UK, it should be suitable. If it uses flared pipe ends, it is ok.