[Healeys] Brake Fluid

[Christopher Moog]

The DOT ratings are US Department of Transportation boiling point 
ratings (wet boiling I think) so DOT5 silicone boils the same range of 
temperatures as DOT5.1. 5 only denotes temperature range so not 
deliberately confusing but incidentally confusing.


On 10/31/2022 12:35 AM, Bob Spidell wrote:
> "... There is a newer Glycol Ester DOT5 ..."
>
> I think you're referring to 'DoT5.1'  I also think it was deliberately 
> named so as to confuse the issue.
>
>
> On 10/30/2022 8:05 PM, Christopher Moog via Healeys wrote:
>> I've used both. Currently prefer DOT4.
>>
>> Also everyone is speaking of DOT5 but there are now two different 
>> DOT5s. The first is the older silicone based DOT5. There is a newer 
>> Glycol Ester DOT5 that is compatible with DOT3 and DOT4. It has a 
>> lower viscosity than the DOT3 and DOT4 so it works better in some ABS 
>> systems. It also has a higher boiling point than DOT3 and DOT4. Don't 
>> see an advantage in Healeys.
>>
>>
>> On 10/30/2022 10:00 PM, Alan Seigrist wrote:
>>> The best selling point for Dot 4 is you can mix any Dot 4 or even 
>>> Dot 3 if you need to fill up.  As I understand it with Dot 5 you 
>>> should be careful to always use the same brand to fill up if necessary.
>>>
>>> Also, neither Dot 5 not Dot 4 is great for sitting a long time, Dot 
>>> 4 absorbs water, Dot 5 will push any water down into the components.
>>>
>>> Dot 4, if the car is not used regularly, needs to be flushed every 
>>> couple of years.
>>>
>>>
>>>
>>> On Mon, Oct 31, 2022 at 5:43 AM Michael MacLean 
>>> <springer.mike51 at gmail.com> wrote:
>>>
>>>     At this point in the restoration I have a completely rebuilt
>>>     brake system with all new components and tubing.  Now is the
>>>     time to make the decision to use DOT 4 or Silicone.  What's the
>>>     consensus, if there is one?
>>>     Mike MacLean
>>>
>
>
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