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Fluid for hydraulic disc brakes



 
 
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  #1  
Old July 4th 08, 04:17 AM posted to rec.bicycles.tech
web guy
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Posts: 3
Default Fluid for hydraulic disc brakes


What are the pros and cons of mineral oil vs DOT 4 as fluid for
hydraulic disc brakes?

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  #3  
Old July 4th 08, 04:41 AM posted to rec.bicycles.tech
[email protected]
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Default Fluid for hydraulic disc brakes

someone trolled:

What are the pros and cons of mineral oil vs DOT 4 as fluid for
hydraulic disc brakes?


Use the fluid the manufacturer recommends, the one with which the
fluid seals and piston cups work best. Any reasonable brake fluid
will not freeze and won't not compress (be spongy).

Of course, this has been discussed at great length here often, so it's
not new. So why ask?

Jobst Brandt
  #4  
Old July 4th 08, 04:42 AM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 3,751
Default Fluid for hydraulic disc brakes

someone trolled:

What are the pros and cons of mineral oil vs DOT 4 as fluid for
hydraulic disc brakes?


Use the fluid the manufacturer recommends, the one with which the
fluid seals and piston cups work best. Any reasonable brake fluid
will not freeze and won't compress (be spongy).

Of course, this has been discussed at great length here often, so it's
not new. So why ask?

Jobst Brandt
  #5  
Old July 4th 08, 05:05 PM posted to rec.bicycles.tech
web guy
external usenet poster
 
Posts: 3
Default Fluid for hydraulic disc brakes

I ask because I am new to cycling and shopping for my first adult bike.
I am looking at the Jamis Allegro 3X and the disc brakes use mineral
oil...but I read someplace that DOT oil works better.

Just wanting qualified opinions before spending my money.

  #6  
Old July 7th 08, 12:17 PM posted to rec.bicycles.tech
Ted Mittelstaedt
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Posts: 69
Default Fluid for hydraulic disc brakes


"web guy" wrote in message
...

What are the pros and cons of mineral oil vs DOT 4 as fluid for
hydraulic disc brakes?


Mineral oil pros:

very much less chance of getting water in it and rusting
something out

Is a lubricant

Does not ruin paint if it is spilled

Is cheap

Can be recycled


DOT-4 Brake fluid pros:

Can withstand thousands of PSI of pressure, hundreds of
degrees of heat. (neither of which you will have on a bicycle)

Works great as a paint remover if you have run out of
paint remover.

Ted



  #7  
Old July 9th 08, 04:46 AM posted to rec.bicycles.tech
jim beam
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Posts: 5,758
Default Fluid for hydraulic disc brakes

web guy wrote:
What are the pros and cons of mineral oil vs DOT 4 as fluid for
hydraulic disc brakes?


one is oil based, the other glycol-ester based. they are not
compatible, and seals are not designed to be interchangeable.

translation: if you use oil in a dot4 system, the seals will fail.
 




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