Chris,
DOT5 is the silicon fluid, DOT5.1 is conventional fluid like DOT4 but
the wet and dry boiling points are brought up to DOT5 spec.
My pick would be the DOT5.1 for a better feel and water absorbtion and
change it every so many years, depending on the climate the car lives in.
Kees Oudesluijs
Chris Dimmock schreef:
> I still use Dot 4. Changed every year or so.
> For all the pedal issues/ have to change everything/ flush everything
> issues we have all heard for years - I never changed.
> Just mentioned this to a good mate who has been racing sprites for
> over 30 years, and who runs a very successful business rebuilding/
> maintaining spridgets, and he said 'huh- been running dot 5 in race
> cars for over 10 years'
> I'll probably go dot 5 next month when I rebuild the whole hydraulic
> system in my BJ8
> So is it 5 or 5.1?
> Already have rebuilt calipers/ 3 new hoses/ rebuilt bj8 booster/
> clutch& brake master cyl kits for my s/s sleeved master cyls & clutch
> s/cyl and nos rear wheels cyls.
> Comments?
> Chris
> www.myaustinhealey.com
>
> Sent from my iPhone
>
> On 10/11/2009, at 2:04 PM, Tom Felts <tomfelts@windstream.net> wrote:
>
>> Don't suppose they said why? Are we to assume why?
>>
>>
>> ---- David Nock <healeydoc@sbcglobal.net> wrote:
>>
>> =============
>> This comes up about every 6 months or so and all I will say is that
>> if you purchase a Girling cylinder or kit in the instructions it
>> clearly states that if you use Silicone fluid your warranty is VOID.
>>
>>
>> On Nov 9, 2009, at 3:06 PM, Eric (Rick) Wilkins wrote:
>>
>>> Silicone is known to be more compressible than DOT 4. That's one of
>>> the reasons that it is not used or recommended in ABS systems.
>>>
>>> The fact that it doesn't absorb moisture is bad because instead of
>>> suspending moisture, it can cause water to "settle" in brake parts
>>> leading to water pockets and/or corrosion from same.
>>>
>>> Wilko
>>>
>>> On Nov 9, 2009, at 1:52 PM, Tom Felts wrote:
>>>
>>>> less water absorption is a negative???
>>>>
>>>> And----my pedals are in no way spongy. Sorry to defend DOT 5 so
>>>> strongly, but seems everything I hear bad about it has not
>>>> happened to me in a very long time of silicone use.
>>>>
>>>>
>>>> ---- Oudesluys <coudesluijs@chello.nl> wrote:
>>>>
>>>> =============
>>>> Although DOT5 has its advantages in:
>>>>
>>>> -not stripping paint like DOT3/4 (I do not know if this also true for
>>>> DOT5.1)
>>>> -less detoriation being not or less hygroscopic
>>>> -higher dry and wet boiling point
>>>> -long life
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