Brake Pipe Renewal

I have to replace 2 sections of my rear brake pipes, they are both badly corroded from the area of the flat plastic inspection cover (under passenger side) to the junctions by the rear nearside wheel arch. I will cut both pipes somewhere under the inspection cover area but is it OK to use 3/16" copper pipe coupled to the original steel pipe.
 
I had them replaced on my previous Z4 and that's how they were done.

IIRC the steel pipe takes a bit more effort to flare for the joint!
 
If you are doing it yourself copper brake line is easier to work with both for flaring the ends and bending to the required shape, copper will work easier if its heatred to cherry red then quenched in water, that softens the metal and aids forming the flares and bending the pipe. Worth investing in a decent flaring tool. I was lucky with my hard lines emerging from the plastic channel at the rear nearside, they cleaned up and were in good order, a coat of black paint had them like new. I did however replace the two flex lines with the hard line between them as that was well rusty. I used stainless flex lines 2 at each rear wheel and singles on the front. You can get siongles of the required length but I wanted to retain the stock securing clips for the rear pipe rout, single length replacement will require the use of cable ties to secure it. I sourced my hoses via ebay ket of 6 hoses circa £80.
 
Thanks for all the replies. I am going to use Kunifer pipe since my neighbour gave me a 10ft length of unused pipe, however I did find that you have to be specific with the flaring tools you use. I borrowed a set that you can buy on ebay for about £11 which caters for several pipe sizes but it was only recommended for aluminium and copper and useless on steel. Since the end I have to connect to is steel I bought a tool called 'Mekanic' which is fixed size (3/16") and handles all materials aluminium thru to steel and specifically designed for car brake pipes which are usually steel. Why BMW couldn't spend a few more pennies and fit cupro-nickel pipes I do not understand, rusty brake lines must be the bane of owners lives.
 
You're right there!

I've had well over 30 cars over the years and it was the first time I've ever needed new brakes pipes before a new exhaust! :headbang:

Seems strange they wnet to the trouble of fitting a stainless exhaust but steel brake pipes. :?
 
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