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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
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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 |
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DOT Fluid
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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 |
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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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DOT Fluid
On 18/06/2020 08:32, John B. wrote:
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 ? -- cheers, John B. Never heard of that requirement. In my car is is changed every 2 years. Lou 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. Errmmm...might be ok. If it's DOT 5.1 |
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DOT Fluid
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DOT Fluid
On 18/06/2020 15:09, sms wrote:
On 6/17/2020 11:07 PM, 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 ? -- cheers, John B. Never heard of that requirement. In my car is is changed every 2 years. Lou Lou I can't imagine changing bicycle brake fluid annually. In a motor vehicle you're supposed to change it every couple of years because you get some water in there, especially in humid climates. Do they also advise you to change the air in your tires? No you can keep the same air as long as you want, if I was you I'd do exactly that and not waste time adding any. |
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DOT Fluid
sms wrote:
On 6/17/2020 11:07 PM, 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 ? -- cheers, John B. Never heard of that requirement. In my car is is changed every 2 years. Lou Lou I can't imagine changing bicycle brake fluid annually. In a motor vehicle you're supposed to change it every couple of years because you get some water in there, especially in humid climates. Do they also advise you to change the air in your tires? Bicycle disk brake system probably have a higher ratio of surface area to volume than automotive systems, and therefore might accumulate water at a faster rate (in much the same way that bike tires go flat faster than car tires). |
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