What size brakepipe to buy?

[eko]

Can someone in the know give me a bit of advice please?
In the next week or so I am going to start removing all the parts from under my project E30 ie complete F+R suspension/petrol tank etc.
After any rust has been treated I will give it a good few coats of Black under there hopefully adding a few more years to the cars life.
Just looking on Ebay at Kunifer brake piping.
Ready to order some but not sure what size pipe I need to get?
3/16 or 5/16?Also the T piece connector above the rear beam,what size do I go for?
Then there are the male unions.They come in packs of 50 but which ones do I need?
Basically I am going to run new brake pipes throughout the car so anyone who has done this what did you go for?
TIA

http://cgi.ebay.co.uk/3-16-CUPRO-NICKEL-KUNIFER-BRAKE-TUBING-25-FEET_W0QQitemZ220010986078QQihZ012QQcategoryZ36631QQrdZ1QQss

http://cgi.ebay.co.uk/3-way-female-brake-pipe-connector-universal-fittings_W0QQitemZ290136402649QQihZ019QQcategoryZ100921QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem

http://cgi.ebay.co.uk/Metric-Male-Brake-Pipe-Fittings-Nuts-Trade-Pack-of-50_W0QQitemZ300205177859QQihZ020QQcategoryZ23013QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem

[jlevie]

Unless there's evidence of serious corrosion of the brake lines, there's probably plenty of other more worthwhile areas to invest money and time. If you still feel the need, those parts, with the correct end fittings, are available from a dealer.

[eko]

Well dont know about the US but most UK cars suffer with corroded brake pipes,especially the one which runs from the T piece above the fuel tank to the front of the car.
I am swapping the fuel tank anyway and fittng an injection tank(car is M10 carb) as ill be putting an M50 in it.
I will also be tending to any rust and then painting the whole underside so replacing all the lines,especially in Kunifer is a must...for me anyway:p
Buying all the parts from the dealer to do the whole car IMO will work out a lot more expensive than buying the right parts and making them up myself!

[FredK]

3/16" Kunifer tubing will work.

You'll need a ISO bubble flare tool as well. BMW stock fittings are M10x1.0. If you don't want to mess with making your own flares, just get pre-terminated brake hard lines from BMW. They aren't that expensive.

I live in the Northeast US and yes, brake pipes just love to rust through, especially the ones at the rear T.

[eko]

Thanks for the info Fred,very helpful.
I dont mind making my own flares,already got a kit from when I was into my old Fords.
Ill price up a full set of pipes from the dealer as a comparison.I reckon im onto a good saving by making up my own but we will see :)