Front Brake Line Question
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Joined: Apr 2018
Posts: 55
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From: WV
Front Brake Line Question
I'm looking to go with 16" Apes and was wondering, with regards to the front brake lines, if there would be any advantage to running 2 individual brake lines down from the master cyl down to each caliper respectively. Thoughts would be greatly appreciated! Thanks.
Road Captain
Joined: Nov 2014
Posts: 680
Likes: 224
From: Buhl, Idaho
Actually, running two lines from the master has been done, but in MY own personal opinion, that tends to make that area look rather cluttered. A single line to the splitter below the lower triple tree is a much more sanitary look. There doesn't seem to be any real noticeable improvement, or otherwise of the brake operation either way. At the shop I worked at, the only bikes we did that double line with were bikes with drag bars, never with apes of any height.
Stellar HDF Member
Joined: Jan 2017
Posts: 2,673
Likes: 2,078
From: Massachusetts
Basic hydraulic principals would tell you, it makes zero difference. The small amount of fluid moved, adds up to an un- measurable amount of fluid friction loss. Not to mention, it just looks goofy! 
HDF Community Team
Joined: Nov 2012
Posts: 6,189
Likes: 2,419
From: USA
Increasing tubing increases the amount of fluid. Brake fluid is compressible. Not by much, but its not zero either. So adding more adds to the compressibility, and makes the lever a little more vague.
A big jump likely would come from the increased amount of flexible tubing. That stuff does expand a bit, and normally one tries to keep its length to a minimum as a result. This looks like its two full runs of flex tubing, so Id expect an appreciable increase in lever squishiness from it.
Grand HDF Member
Joined: Sep 2017
Posts: 3,835
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From: Southern Virginia
In looking at the picture of that kit one other potential problem comes to mind. Look how long that bolt sticks out from the master cylinder. I know it's unlikely, but I would be concerned that it could accidentally snag on something during a drop and rip right off.
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Grand HDF Member
Joined: Jun 2017
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From: Near Yosemite
I would also think that you would have two different lines wanting to flex in two different direction depending on whether or not you were turning your bars either left or right, even with tie wraps, they will want to move differently and independently.
OP, what is your reasoning for wanting to do this? What are YOU hoping to gain from it?
OP, what is your reasoning for wanting to do this? What are YOU hoping to gain from it?
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Mar 27, 2010 08:51 AM