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DOT Fluid



 
 
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  #1  
Old June 18th 20, 05:48 AM posted to rec.bicycles.tech
jOHN b.
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Default DOT Fluid


Someone cautioned that DOT brake fluid, in bicycle disk brakes, should
be changed annually.
Is this correct? A requirement of the disk makers? Or ?
--
cheers,

John B.

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  #2  
Old June 18th 20, 07:07 AM posted to rec.bicycles.tech
[email protected]
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Default DOT Fluid

On Thursday, June 18, 2020 at 6:48:38 AM UTC+2, John B. wrote:
Someone cautioned that DOT brake fluid, in bicycle disk brakes, should
be changed annually.
Is this correct? A requirement of the disk makers? Or ?
--
cheers,

John B.


Never heard of that requirement. In my car is is changed every 2 years.

Lou

Lou
  #4  
Old June 18th 20, 08:22 AM posted to rec.bicycles.tech
Rolf Mantel[_2_]
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Posts: 267
Default DOT Fluid

Am 18.06.2020 um 08:32 schrieb John B.:
On Wed, 17 Jun 2020 23:07:14 -0700 (PDT), wrote:

On Thursday, June 18, 2020 at 6:48:38 AM UTC+2, John B. wrote:
Someone cautioned that DOT brake fluid, in bicycle disk brakes, should
be changed annually.
Is this correct? A requirement of the disk makers? Or ?


Never heard of that requirement. In my car is is changed every 2 years.


Somebody here, talking about bicycle disk brakes mentioned that DOT
liquid must be changed annually while mineral oil did not require
this.

As the DOT brake oil in my pickup truck has been there for probably 20
years without being changed I asked the question.


Outch. DOT brake fluid (as opposed to mineral oil) is strongly
hygroscopic, i.e. it absorbs water, changing it properties
significantly. Therefore, DOT brake fluid must be changed regularly; in
Europe, the age of brake fluid is one of the safety checks that need to
be documented every 2 years, or the car will be taken out of service.
If your truck was 40 years old instead of 20, it might still have the
old mineral oil that doesn't need changing

In cars and motorbikes, the exchange interval is every two years
irrespective of mileage. Possibly, in bicycles it has to be changed
more often due to the smaller brake fluid container, or possibly the
bike manufacturers are just more cautios if they stipulate annual change.

Given that bicycles have significantly lower problems with overheating,
mineral oil seems more appropriate than DOT fluid for bicycle brakes.

Rolf
  #5  
Old June 18th 20, 09:20 AM posted to rec.bicycles.tech
Tosspot[_3_]
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Posts: 1,563
Default DOT Fluid

On 18/06/2020 06:48, John B. wrote:

Someone cautioned that DOT brake fluid, in bicycle disk brakes,
should be changed annually. Is this correct? A requirement of the
disk makers? Or ?


That was me, and istr it from my Hope brakes. Which use DOT 5.1, again
iirc.
 




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