I fitted a Wilwood lever style bias valve into my track car which has 1/8" NPT threaded ports for the inlet and outlet, and braided lines supplied by mrswampy which go into and out of the bias valve.
The braided lines have 10mm threaded ends as far as i am aware and use a 1/8" NPT to 10mm threaded adapter to connect them to the bias valve.

I seem to have a small leak somewhere on this setup, i can press the pedal as hard as i want and you won't see any fluid come out but after say 30 mins you will feel brake fluid if you rub your finger under the joints. I don't know whether its the NPT joint or the 10mm-10mm joint thats leaking but i have bought another litre of brake fluid and want to get it fixed.

The adapters are screwed into the bias valve pretty tight and likewise the lines to the adapters.

What are your suggestions for sorting it out, i'm heading off to the 'ring in a few weeks so need it sorting asap so i can finish off testing the car's reliability in advance

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Goldie the track car.

You havent over tightnd the union in o the bias valve and crackd it?
Its a taper fit, so slightly narrower at the bottom than the top of the thread.

Can you take a pic of all the components.

You could try this. I'm not too sure about it though.

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Ex SC-6

Now in a Megane R26

The bias valve came with these fittings, they are 1/8" NPT to 3/8 24TPI adapters which are apparently to suit double flared brake lines.


Looks like they like to use a loctite type sealant on their threads.
I'll call a few motor factors and see if anyone has some brake line sealant in, though im sure its not the best way of going about it.

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Goldie the track car.

I've just been for a test drive down some back lanes and it seems to have stopped leaking altogether now

I think i will order a couple of these
Hopefully the brass will form a better seal with the ally and stainless than the stainless adapter did and solve the problem.

Thanks for the info though phil, if it still leaks with the brass adapters i'll give that a try

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Goldie the track car.

They are 1/8" NPT to M10x1mm adapters.
I think it's where the adapters go into the housing that are leaking rather than where the lines meet the adapters.

I will get them brass adapters ordered and may buy a bottle of thread sealant just to make bloody sure that they won't leak as i can't be arsed paying £16 for another fluid change if the brass adapters alone don't fix it.

Touch wood that the bleed nipples havent had chance to seize yet

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Goldie the track car.