Cutting Shimano Deore Hydraulic Disc Brake Cables

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Craig321
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Cutting Shimano Deore Hydraulic Disc Brake Cables

Postby Craig321 » Fri Jul 09, 2010 19:18 pm

Hi,

Does anyone have/know of a decent guide I can use to cut my Shimano Deore brake cables without having to re-bleed?

I have a fair bit of length to come off to neaten the bike up a bit and obviously don't want to just go cutting without researching.

Thanks,
Craig.

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peter413
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Postby peter413 » Fri Jul 09, 2010 19:19 pm

I think you always have to bleed them

Craig321
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Postby Craig321 » Fri Jul 09, 2010 19:22 pm

Hmm, I'm not sure if it depends on the make of the brakes?

This guide shows you how, but they're using a different make: http://www.bikemagic.com/maintenance/sh ... /4807.html

DaveHudson
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Postby DaveHudson » Fri Jul 09, 2010 19:37 pm

As long as the lever is not actuated while the system is "open" you will be fine. I had to trim the m595 hoses and have not had to bleed them.

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The Rookie
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Postby The Rookie » Fri Jul 09, 2010 20:05 pm

I'm assuming as youare talking bleeding you mean hoses not cables?

Simon

Craig321
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Postby Craig321 » Fri Jul 09, 2010 21:01 pm

The Beginner wrote:I'm assuming as youare talking bleeding you mean hoses not cables?

Simon


Yep

DaveHudson wrote:As long as the lever is not actuated while the system is "open" you will be fine. I had to trim the m595 hoses and have not had to bleed them.


I.e. don't touch the brake level while cutting? :P

Would it just be a case of unscrewing, cutting, and screwing back in then? Providing I do it properly and don't need to re-bleed?

DaveHudson
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Postby DaveHudson » Fri Jul 09, 2010 21:39 pm

Yeah that's it, I just used a posh word :lol:

You will need a new barb and olive I think but otherwise just unscrew and trim then put back.

Craig321
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Postby Craig321 » Sat Jul 10, 2010 11:18 am

DaveHudson wrote:Yeah that's it, I just used a posh word :lol:

You will need a new barb and olive I think but otherwise just unscrew and trim then put back.


Why would I need a new barb & olive. Do they not go back on once taken off?

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snotty badger
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Postby snotty badger » Sat Jul 10, 2010 11:46 am

Surely if you cut the hose the fluid will leak and air will get in?! :?
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RupertCommunicator
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Postby RupertCommunicator » Sat Jul 10, 2010 15:01 pm

Personally I would empty the system first, cut then re-bleed, but if you think you can do it without bleeding, crack on and good luck to you! :D

yeehaamcgee

Postby yeehaamcgee » Sat Jul 10, 2010 15:42 pm

you will definitely need to bleed the system after cutting the hose, unless you perform the enitre operation submerged in mineral oil (or brake fluid for other brands of brakes)

W00DENT0P
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Postby W00DENT0P » Sat Jul 10, 2010 16:03 pm

As said, as long as you don't operate the lever while you have the the hose disconnectedit'll be fine, no need to bleed them.
You might get on odd drip from the lever but seeing as the reservoir cap is still on then its still sealed, the chance of getting air into the lever thru where the hose connects is pretty slim, same with the hose / caliper.
On the small chance of getting any air in the system, just place the lever so the reservoir cap is level, remove it then just pull the lever a few times, this will allow any small bubbles rise back up into the reservoir.
Swapped / shortened loads (problys 100's) of hoses and its very rare you need to bleed the system.

paul.skibum
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Postby paul.skibum » Sat Jul 10, 2010 19:29 pm

You will need a new Olive at the very least - the old one will have been squished by the assembly and need replacing - barb may be salvageable. I'd probably bleed it again - doesnt take long.
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