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Trialtech Fluid in Shimano Disc Brake?


niconj

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I have had some Shimano disc brakes that, when pulling the lever quickly a couple of times, move the bite point away from the handlebar. This seems to be a mechanic disadvantage that most of the Shimano brakes have (and Trail riders start to complain about it with the new XT 8000 series). 

Some people started using "Putoline" as a replacement for the Shimano Oil and it seems to get rid of the problem due to it's lower viscosity. 

My question is whether the Trialtech fluid would be suitable for Shimano disc brakes as well. In trials we don't care about the boiling temperature and since the fluid works in a HS33 without destroying the seals, it should work in a Shimano brake as well (I have run Shimano Brakes with Royal Blood without problems). 

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not sure if it'll have any relevance but I bled an MT7 with water and there was not noticeable difference in lever feel, perhaps it could be the same with Shimano discs so don't be disappointed if it doesn't do what you're after 

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4 minutes ago, Ali C said:

not sure if it'll have any relevance but I bled an MT7 with water and there was not noticeable difference in lever feel, perhaps it could be the same with Shimano discs so don't be disappointed if it doesn't do what you're after 

Have you never experienced (Shimano not Magura brakes) that the bitepoint moves away from the handlebars when pulling the lever quickly a couple of times? A fluid with lower viscosity should do the trick (as Putoline seems to do for MTB riders here in Germany).

Edited by niconj
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18 minutes ago, Ali C said:

that just sounds like any disc when they've got a little air in the system.

Yes and no. It is a symptom of air in the system but also of some Shimano brakes that don't have any air in the system. There's a big discussion going on right now on another forum with some specialists (not Shimano) trying to shed light on the issue. Something to do with the compensation bore being to small and Shimano fluid having a viscosity that is too high to be able to flow back quick enough when pulling the lever a couple of times in a row (especially at lower temperatures).

Edited by niconj
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1 hour ago, Ali C said:

ah ok, give it a try I say!

Will do so. I was just wondering about the fluid destroying the seals or something. Since you've got the Maguras for free, you are less reluctant to try those things. :P

BTW: How did you get the oil out of the MT7 before bleeding it with Trialtech fluid?

Edited by niconj
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3 hours ago, niconj said:

Yes and no. It is a symptom of air in the system but also of some Shimano brakes that don't have any air in the system. There's a big discussion going on right now on another forum with some specialists (not Shimano) trying to shed light on the issue. Something to do with the compensation bore being to small and Shimano fluid having a viscosity that is too high to be able to flow back quick enough when pulling the lever a couple of times in a row (especially at lower temperatures).

Why ask for help if you're going to disregard it anyway. 

 

The problem is with air in the system. If you push the pistons back and forth a few times whilst pulling the leaver all the air will go into the master cyclinder and stop the problem. 

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23 minutes ago, BJ. said:

Why ask for help if you're going to disregard it anyway. 

I didn't ask for help regarding air in the system as this isn't the case. I asked whether the fluid would be suitable for disk brakes as well or whether there would be any disadvantage I haven't thought of yet except for the apparent heat issue (which in Trials doesn't matter).

 

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