The long version:
Tarquini's rear brakes are not good enough for Doctor Death to give the beast a MOT so I'm gradually changing everything until they give me the magical 130kg of effort neeed. MOT test only showed 60kg so even though it felt okay and stopped okay, obviously it wasn't actually okay.
As part of my attempts to get the beast up to muster, I fitted a new compensator valve (+20kg) new pads and handbrake cables (separate "Advisories") and finally new calipers (+20kg). I'm only at 100kg.. so still waaay off, though miles better than before.
The good Doctor did notice that some of the metal pipes were twisted however and reckoned this could be the cause.. (if they became internally impeded) though to be fair he's quite sceptical and puzzled because the compensator and calipers should have done it.
The brakes bleed okay.. lots of fluid comes out and not much effort required, so that would suggest the pipes are fine. Also, the brakes "have always been ****" according to the Doctor... it's always a borderline pass and has been for the last 4 or 5 years.
Anyway.. there's not much left to change
and pipery is just a few quid after the bigger items above, so I decided I'll change them anyway. I already have steel braided hoses on the calipers and it could be that any twisting happened when I fitted those...
I ordered up the pipes from Mr Romeo .. 4 to/from the rear brake compensator and one on each trailing arm, so 6 altogether. I also got new flexible pipes for the trailing arm pivot.
However, AR's parts supply for such an old beast is not toooooo good and of the 6 metal pipes, only 2 are still available, so I'll need to make the others. Go to "The short version".
The short version:
I had a look at what sort of brake pipe tubing is available.
I think I need 3/16" (5mm) tube... seems to be about the right size and the most common?
I also think the unions are "10mm" males, though there are also two larger ("12mm"?) unions on the pipes to the brake compensator (2x10mm, 2x12mm) as when I changed the compensator I remember 2 of the unions were a bigger size than the other two.
Is that right?
Does the 10mm/12mm for the unions refers to the nut size or the thread diameter? I remember using an 11mm brake spanner when I did the compensator
Also.. what's better or what's the pro's and con's of using copper or that Kunifer doodah? Kunifer sounds a bit more like the kind of gig I want to go to (cupro-nickel rather than just copper) but is it fantastique or does it have other issues that make it inferior to copper in some/any way?
I can buy the flaring tool and a bender
once I have all the bits and pieces I need. I never made my own pipes before so could be interesting...
and any tips will be useful.