Hi,
Can anyone tell me the correct bleed nipple size for the breaks ?
I have a UK 1983 x1/9 and it’s leaking from the bleed nipple. I looked it up and ordered a replacement but it’s too small.

Have you tried 8 x 1.25mm? Afaik, this is what was used on all the X1-9's and most other older Fiats.

Maybe remove one of the bleed screws to check the size?
If you clamp the brake hose, you can remove one of the bleed screws without losing fluid or having to bleed the brakes afterwards.

Al.

Thanks hopefully I have ordered the right one now ??