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View Full Version : Brake lines??



damo1
21-10-2007, 08:23 PM
Heres one for you.

Ive been thinking of running one brake line all the way to one caliper then running the other line from that caliper over the top of the guard to the other.

My question is this

If the line runs to one side does it start building pressure and applying one caliper before the pressure builds enough to then start the other one working.

I under stand that it would happen so quickly that you probly wouldnt notice but in my fucked up brain thats whats going to happen.

And as a result your braking could be affected slightly.

Just been wondering and thought id ask the question:D

Large
21-10-2007, 08:31 PM
Pressure is equal throughout the system. (I think that's one of the ummutable laws of physics) Think about it this way. If it made a difference...all those single disc bikes would be running off the road everytime they hit the brakes



btw That's how my GSXR came from the factory

damo1
21-10-2007, 09:01 PM
I didnt mean that it would make the bike turn.

Large
21-10-2007, 09:16 PM
What are you worried about then?

You learning stoppies?

Rocket
21-10-2007, 09:31 PM
Stu sells them as one line down and one over the guard to the other caliper so it must be fine.
Check out "O" option here >>>>> http://ausfr.com.au/cart/shopexd.asp?id=154&bc=no

EDIT ** Just read the last line of Large's post.....carry on, nothing to see here.

Issues
21-10-2007, 10:05 PM
the fluid will take path of lease resistance, so the first caliper will move first until it contacts the disk then the fluid will go to the other. But it will not have to move far so will not be noticable, the affore mentioned law of physics is correct providing the resistance preasure is equall at all points. I'm not a fluid dynamics engineer but this is how it works in practice. I would run it this way, it keeps the lines tidy.

Hagarr
21-10-2007, 10:20 PM
Go for it works perfectly you won't have any drama's. Can't explain the Physics of how it works but the WSB guys (And Myself) have been doing it for years.

Jockney Rebel
21-10-2007, 11:57 PM
issues is right damo, itll only affect ur brakes the first time its applied ,after that it wont be noticable let me know when u want some line ive got it in mate

Jockney Rebel
21-10-2007, 11:59 PM
i tell u what damo im taking the lines off the triumph if u take a little ride up here we can try different set ups if u like

Gix11
22-10-2007, 12:50 PM
Yea, good question. I wasn't too sure and have been running twin lines, piggy-backed from the master ever since. The splitter was just crap and the line over just confused me. I heard racers ran the twin so just went with it. A lot of bikes come out with the line over as standard from showrooms - must be cheaper for the manufacturers (i.e. no splitter, less metreage)?

Large
22-10-2007, 02:03 PM
quote:Originally posted by Issues

the fluid will take path of lease resistance, so the first caliper will move first until it contacts the disk then the fluid will go to the other. But it will not have to move far so will not be noticable, the affore mentioned law of physics is correct providing the resistance preasure is equall at all points. I'm not a fluid dynamics engineer but this is how it works in practice. I would run it this way, it keeps the lines tidy.



When you squeeze your brake lever, you're not moving fluid, you're building up pressure within the whole brake system. You can't have pressure at one caliper without the same pressure at the other caliper. That pressure has to go somewhere and it takes the path of least resistance - by moving the calipers. If your calipers are the same make and model and in similar condition they will move at exactly the same time.

Iceman
22-10-2007, 02:44 PM
I've been want to get rid of my splitter for a while now, purely for cosmetic reasons. This might be the way for me to go too.

damo1
22-10-2007, 04:43 PM
quote:Originally posted by Large

What are you worried about then?

You learning stoppies?


Na mate can already do them.

Issues: thats exactly what i was thinkin.

Jim: Ill let you know when i can make the trip.

Jockney Rebel
23-10-2007, 01:06 AM
ok mate no worries

FIGHTERMC
23-10-2007, 02:45 AM
Damo i have this setup on my blade
and its works ok mate.

zx12argh
23-10-2007, 12:18 PM
quote:Originally posted by Large


quote:Originally posted by Issues

the fluid will take path of lease resistance, so the first caliper will move first until it contacts the disk then the fluid will go to the other. But it will not have to move far so will not be noticable, the affore mentioned law of physics is correct providing the resistance preasure is equall at all points. I'm not a fluid dynamics engineer but this is how it works in practice. I would run it this way, it keeps the lines tidy.



When you squeeze your brake lever, you're not moving fluid, you're building up pressure within the whole brake system. You can't have pressure at one caliper without the same pressure at the other caliper. That pressure has to go somewhere and it takes the path of least resistance - by moving the calipers. If your calipers are the same make and model and in similar condition they will move at exactly the same time.



oooh quick.. someone mention the hydrostatic paradox [:p]

fimpBIKES
23-10-2007, 01:08 PM
haha, let the mortals have their fun zx12argh ;)

Large
23-10-2007, 01:20 PM
quote:Originally posted by zx12argh


quote:Originally posted by Large


quote:Originally posted by Issues

the fluid will take path of lease resistance, so the first caliper will move first until it contacts the disk then the fluid will go to the other. But it will not have to move far so will not be noticable, the affore mentioned law of physics is correct providing the resistance preasure is equall at all points. I'm not a fluid dynamics engineer but this is how it works in practice. I would run it this way, it keeps the lines tidy.



When you squeeze your brake lever, you're not moving fluid, you're building up pressure within the whole brake system. You can't have pressure at one caliper without the same pressure at the other caliper. That pressure has to go somewhere and it takes the path of least resistance - by moving the calipers. If your calipers are the same make and model and in similar condition they will move at exactly the same time.



oooh quick.. someone mention the hydrostatic paradox [:p]


Does that matter in a sealed system with both calipers at the same height and the lines the same diameter?
[:p]

(yeah yeah, I googled it)

damo1
23-10-2007, 03:00 PM
quote:Originally posted by FIGHTERMC

Damo i have this setup on my blade
and its works ok mate.



Cheers Fighter;)

Large
23-10-2007, 03:20 PM
Hey damo,

I saw a big group of learners mostly on postie bikes pulled up in St Ives today. Is that your mob? I had a look for you but didn't recognise anyone.

damo1
23-10-2007, 04:51 PM
quote:Originally posted by Large

Hey damo,

I saw a big group of learners mostly on postie bikes pulled up in St Ives today. Is that your mob? I had a look for you but didn't recognise anyone.


Yeah sure was mate there would have been about 15 new posties and 3 instructors i worked with them yesturday but had today off so missed the road ride with them.

They do a new start course for the posties over two days.

Large
23-10-2007, 05:23 PM
quote:Originally posted by damo1


quote:Originally posted by Large

Hey damo,

I saw a big group of learners mostly on postie bikes pulled up in St Ives today. Is that your mob? I had a look for you but didn't recognise anyone.


Yeah sure was mate there would have been about 15 new posties and 3 instructors i worked with them yesturday but had today off so missed the road ride with them.

They do a new start course for the posties over two days.


Half of them looked like Indians or middle eastern gents. I wonder how long they'll survive

Shifty
28-10-2007, 06:38 PM
Longer than in their home countries no doubt... haven't seen any tanks or snipers lately!

damo1
28-10-2007, 07:01 PM
quote:Originally posted by Shifty

Longer than in their home countries no doubt... haven't seen any tanks or snipers lately!


OOOHHHH first post and a cracker :D

your going to fit just fine here shifty;)welcome aboard mate:D

Jockney Rebel
28-10-2007, 11:09 PM
right ill settle this my business is the sharp end of hydraulics ....and the difference will be negligible
we can argue theoretical fluid dynamics but in practical terms the system in question will work and on a road bike have no noticable effects
hi shifty mate damos right u will fit right in here