Twin brake lines

[stickers]

Gday guys has anyone changed there brake lines for twin lines.

I am just about to put on some M4 monoblocks and an RCS need to ditch the crossover lines for a twin line setup.

I have seen the Goodridge lines and must say im not a fan of there lines. Has anybody found line kits elsewhere

Cheers fellas

[Steviejuk]

I fitted monoblocs from a RSV4 and twin lines to an R1 radial M/C I had kicking about. I just measured up what I needed and used Venhill Power hose lines and fittings. Youll need 45 deg. ends for the calipers as the fittings are on the inside of the caliper which point the banjos toward the wheel. Routing the left hose is a bit of pain to stop it getting caught in the steering damper, and I'm not entirely happy with how its ended up , but it's out of sight so I can live with it. but I've now got brakes with power and feel.

[Hyper]

I also need exact measures , i have the same combo ready to mount: (m4 + RCS )

[SlipinSlidin]

Do you really think there's a big benefit to dollar ratio with the twin like setup?

[loknload]

I run nothing but 2 line setups on my racebikes and I run superbike lines that screw directly into the calipers and do not use a banjo bolt and I buy -2 lines that are smalle diameter than OEM lines. Galfer and Goodrich are OK but I have used Speigler lines on my last few bikes including a Z1000 that I put a ZX6R front end and radial calipers on. What I love about Speigler is that you can call them up, tell them what master and what calipers you are using and, most of the time, they already have the measurements for the bike and will build them in any color you want with the correct ends and get them out to you in a couple of days. My set for the Z1000 was about $140 and well worth it. Give them a call and see what they can do for you.

[Mibridger]

I have two lines on mine, M4 calipers but still using original MC
I got them from HEL performance in the UK, they are my local supplier and are
Very helpful.

Kind regards,

Mark

[scott2ride]

Is there a scientific justification for 2 lines? As it is hydraulic pressure & can't see the advantage in twin set up? The dynamics are fluid (no pun intended) & results from a twin setup or flick over lines should be the same.

However internal tube diameter will factor, as does the ease of changing things in a hurry in superbike races.

Give me insight lads!

[Steviejuk]

I'm not too sure about being scientific but it's something I try to do on all my bikes as I find you get slightly better feel - whether that because I've re-bled the brakes I don't know. In theory, I believe a with a single line setup, the 'first' caliper will affect the line pressure to the second, and a UK bike magazine reported uneven pad wear with single a line set-up. Thats probabably mostly bollocks, and I do it to be different and it's a bit of bling. My brake set-up is an improvement over stock but a lot of that is the radial master cylinder which I changed just because I happened to have one which matches the CRG clutch perch and lever I need to use due to a having knackered left wrist.

[ShaunD]

The advantage of two lines is safety. The lines as they are currently setup are fed to one side of the calipers and then crossed over to the other side. In the event of something happening to the main hose there will be absolutely no brakes. Two lines always ensuer that at least there are some brakes. Admittedly more likely to happen on Japanese bikes due to there rubber hose set up. Happened some years ago in a 500GP race, the front mudguard shattered and broke the downline with the end result being a huge accident, after that the FIM d that two lines be made compulsory.

[ChrisE]

I question the safety issue. On a two line setup, if a single line fails/leaks or a pad comes out or a pad seal is blown, as you squeeze the brake lever, you will just force all the fluid out of the area and not get pressure on the side that is still intact, effectively no brakes. Your lever will come all the way back to the handlebars.

The only way two lines are any safer than a single setup is if two independent Master Cylinders are used, one for each line and they wold require a pressure balance so one side would not exert more pressure and lead to uneven braking . I'm unaware that anyone makes this setup

[TimeBandit]

.... and I run superbike lines that screw directly into the calipers and do not use a banjo bolt
....

.... measured up what I needed and used Venhill Power hose lines and fittings.
....

This is why I like coming to this forum: not heard of Venhill yet - seems like a viable alternative. And got my lines from Speigler too - but didn’t know they offered connections that go directly into the caliper. Another nice thing about them is the ability to rotate the ends.

The advantage of two lines is safety. The lines as they are currently setup are fed to one side of the calipers and then crossed over to the other side. In the event of something happening to the main hose there will be absolutely no brakes. Two lines always ensuer that at least there are some brakes.
....

Safety? I am certain in both dual-line and cross-over (“Y”) setups the hydraulic force is contiguous - aka ANY line gets damaged and you loose both right & left breaks.

The main different over these configurations is cost (less net hose), aesthetics (single line at master looks cleaner), steering (less drag/resistance although why split hairs), and finally singles might exhibit firmer feel due to less net hose surface area expansion - granted today’s braided lines exhibit little if at no expansion, so this advantage might better apply towards rubber hose setups which is why split setups are commonly used with rubber.