LemonHead

Hey guys. I'm putting in a proportioning valve and want to confirm that the OD of the hard brake lines is 3/8". Is that correct? How about the threads that go into the MC and calipers? Anybody know the spec's on these off-hand? Thanks in advance.

LemonHead

I'm realizing as I think about this more that there's no way the OD of the brake lines is 3/8". Anybody know what it is? Don't get me wrong, I'd just measure it myself but the car is stored about 20 miles away. Thanks in advance.

borini63

I know it's a 10mm metric!!

rogerz

I think that is the size of the nut not the tubing diameter.

evandubya

Yes the nut is 10mm, the soft line is roughly 3/8" and the hard line is about 3/16".

SHADY280

hard brake lines are pretty standard so you should be good to go. the biggest thing is getting the right nut on before you flare.

LemonHead

Thanks for the replies guys. I think I have confirmed that the brake fittings are 1/8-27 NPT. Any chance somebody has an accurate digital caliper that they could measure the OD of the hard rear brake lines for me? Would be very appreciative!!!