Question about braided lines

[Chrislost]

Is it better to have seperate lines from the master cylinder to each caliper, or to have one line down and one accross to the other caliper?

Both my bikes have 2 lines down and i favour this method, howeveri have noticed a few late model standard bikes have one down and one accross.

[cs363]

Interesting question and it will be interesting to see what replies get thrown up.

My immediate thought would be that individual lines to each caliper would give the best result and that the modern sportbike line routing is probably done to save on costs.

However, I must emphasise that I am purely speculating.

[bogan]

cos they are hydraulic lines, with very little fluid flow, i doubt it would make much difference at all.

[cs363]

Sounds like bogan may be onto it, given the comments on this page regarding pressure:http://www.h-e-l.co.uk/brake-doctor/index.htm

No doubt the reduced cost of running extra brake hoses does come into it as well though.


Though it's interesting to note that looking at all the pics of current WSB & Moto GP bikes that I can find, they all appear to be running the individual hoses from master cylinder to calipers.

[Shaun]

I have always made and used 2 lines WHY, because I believe it is easier to work with some thing that is direct, and not about direct?

Banjo's and T Joints CAN also be a point where AIR can be trapped, so eliminating one more potentuall problem has got to be good?

I always include a bleed nipple into the master and lines up top ( If not there in the first place) as AIR is supposed to rise!


O and a TEE Joint is about $45 RT as well, so about the same cost for Dual or single/Duel

[NZsarge]

I would lean toward separate line to each caliper.
If your set up is in series as in one down then across over to the next it makes sense to me that it would have to begin pushing one set of pads onto the disc before the line pressured up to move the last set onto the disc, then again I don't know anything about fluid dynamics so..
It would also stand to reason there would be equal pressure to each caliper with separate lines too would'nt it?

[CookMySock]

I would use one line down, and keep the line to the second caliper as short as possible. I would use braided-over-flexible hose where I was forced to, or else I would use solid steel lines everywhere else. I would use the smallest possible diameter of each.

Steve

[Two Smoker]

I have always made and used 2 lines WHY, because I believe it is easier to work with some thing that is direct, and not about direct?

Banjo's and T Joints CAN also be a point where AIR can be trapped, so eliminating one more potentuall problem has got to be good?

I always include a bleed nipple into the master and lines up top ( If not there in the first place) as AIR is supposed to rise!


O and a TEE Joint is about $45 RT as well, so about the same cost for Dual or single/Duel

Agree with Shaun... Apparently he knows what he is talking about... most of the time hehehe.

Another reason that racers use individual lines to each caliper is so that the hoses are out in the airflow to aid in cooling and reduce overheating. thus improving brakng...

[98tls]

Two smoker probably has a valid point re cooling but apart from that i cant possibly see how it can make one iota of difference if the lines are properly bleed,was dicussed on the TL website awhile back and i followed a few links etc and those that supposedly know these things agreed it makes not one bit of difference.

[Pixie]

I would lean toward separate line to each caliper.
If your set up is in series as in one down then across over to the next it makes sense to me that it would have to begin pushing one set of pads onto the disc before the line pressured up to move the last set onto the disc, then again I don't know anything about fluid dynamics so..
It would also stand to reason there would be equal pressure to each caliper with separate lines too would'nt it?

You're correct-you don't know anything about fluidics

[Pixie]

Agree with Shaun... Apparently he knows what he is talking about... most of the time hehehe.

Another reason that racers use individual lines to each caliper is so that the hoses are out in the airflow to aid in cooling and reduce overheating. thus improving brakng...

Fluid in a braking system is effectively static.So heat transfer via the brake lines is negligible

[cs363]

You're correct-you don't know anything about fluidics

Yeah, I think people aren't reading the applicable section in that link I posted, so here's a cut and paste:

Pressure - Is a constant in the hydraulic system. If you put 10 psi into a system hydraulic laws state that this 10 psi will act on all surfaces within the system equally. Pressure In = Pressure Out.

I know it does tend to go against what our gut feeling is about how this would work, but a facts a fact!

[AllanB]

Yeah, I think people aren't reading the applicable section in that link I posted, so here's a cut and paste:

Pressure - Is a constant in the hydraulic system. If you put 10 psi into a system hydraulic laws state that this 10 psi will act on all surfaces within the system equally. Pressure In = Pressure Out.

I know it does tend to go against what our gut feeling is about how this would work, but a facts a fact!

Excellent - so you just pick the setup that you think looks the coolest

[cs363]

Excellent - so you just pick the setup that you think looks the coolest

Lol, well it does seem to point to that!

[Pussy]

Brian Bernard once told me that the main reason for using two lines from the master cylinder is ease of fitting calipers quickly.
I have stock pattern Goodridge lines on my sem fiddy... I chose them to keep a relatively stock look. They perform very well