[DeTomaso] Master Clutch Cylinder

[Tomas Gunnarsson]

The stuff I use is probably closer to "elephant snot" than "quality stuff"! :-D 

Tomas

----- Original Message ----- 
From: <adin at frontier.net>
To: <detomaso at realbig.com>
Sent: Thursday, July 17, 2008 8:00 PM
Subject: Re: [DeTomaso] Master Clutch Cylinder


> Probably not Dot 3 vs. Dot 4 . . . I was thinking that possibly using  
> HOZip9 El cheapo elephant snot brake fluid (instead of quality stuff)  
> was having an effect on the rubber.  I believe we can discount that now.
> 
> David
> 
> 
> Quoting Tomas Gunnarsson <guson at home.se>:
> 
>> I seriously doubt that the problem is that one uses DOT 4 instead of  
>>  DOT 3. I've not run anything but DOT 4 in any of my cars for the   
>> last 20+ years, in the Pantera for 12 years now. I don't even think   
>> DOT 3 can be found on the common market (read: gas station etc) over  
>>  here.
>>
>> Tomas
>>
>> ----- Original Message -----
>> From: "Trevor Fougere" <trevor at fougere.com>
>> To: <detomaso at realbig.com>
>> Sent: Thursday, July 17, 2008 8:00 AM
>> Subject: [DeTomaso] Master Clutch Cylinder
>>
>>
>>> Well...on the plus side I've run 5,000 miles on it after replacing the DOT 4
>>> that had been in there for the previous 5,000.
>>>
>>> This change over was after a debate, of sorts, with the Pantera Community
>>> insisting on DOT 3 or DOT 3/4.  Versus
>>> DOT 4 arguments.
>>>
>>> The fact is the seals in my 3rd Master Clutch Cylinder are disintegrating.
>>> At least they didn't disintegrate immediately upon
>>> installation like the 2nd one, or soon after I purchased the car as with the
>>> 1st MCC.
>>>
>>> Frankly, the whole subject confuses me. The following Wikipedia entry seems
>>> to imply that DOT 4 would be better.
>>>
>>> Trevor
>>>
>>>
>>>
>>> According to Wikipedia: http://en.wikipedia.org/wiki/DOT_3
>>>
>>> DOT 3 is one of several designations of automotive break fluid, denoting a
>>> particular mixture of chemicals imparting specified ranges of boiling point.
>>>
>>> In the United States, all brake fluids must meet federal standard #116.
>>> Under this standard there are three DOT minimal specifications for brake
>>> fluid. They are DOT 3, DOT 4 and DOT 5.1
>>>
>>> DOT 3, like DOT 4 and DOT 5.1, is a polyethylene glycol based fluid
>>> (contrasted with DOT 5, which is silicone based). Fluids such as DOT 3 are
>>> hygroscopic and will absorb water from the atmosphere. This degrades the
>>> fluid's performance, and if allowed to accumulate over a period of time, can
>>> drastically reduce its boiling point. In a passenger car this is not much of
>>> an issue, but can be of serious concern in racecars or motorcycles.
>>>
>>> As of 2006 most cars produced in the U.S. use DOT 3 brake fluid.
>>>
>>> Girling brakes, which were widely used in British cars in the mid-20th
>>> century, use nitrile seals, which are degraded by DOT-3 brake fluid. Many
>>> owners of British cars had no problems with their brakes as long as their
>>> brakes were serviced by a British-car dealer who used the
>>> Girling-recommended "Castrol Golden Amber" brake fluid, but at some
>>> indeterminate time after allowing a non-specialist mechanic to top up oil
>>> and "all fluids," felt their brake pedal go to the floor without stopping
>>> the car. The problem: the generalist mechanic used DOT-3 brake fluid in all
>>> cars and rarely sees a British car (twice). The solution-after body
>>> repair-is to drain the brake system and rebuild all cylinders with new
>>> nitrile seals, then fill the system with the Girling-recommended fluid.
>>>
>>> Boiling points
>>>
>>> Minimal boiling points for these specifications are as follows:
>>>
>>> (C-Centigrade, F-Fahrenheit)
>>>
>>> Dot 3    205C (401F) Dry, 140C(284F) Wet
>>>
>>> Dot 4    230C(446F) Dry, 155C(311F) Wet
>>>
>>> Dot 5    260C(500F) Dry, 180C(356F) Wet
>>>
>>> Dot 5.1    270C(518F) Dry, 191C(375F) Wet
>>>
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