Re: Storage, changing fluids, etc.

["jtrealty@xxxx " <jtrealty@xxxx>]

The reason for the change of the brake fluid is that the origional 
fill was girling dot 3. It was assumed that that would also be the 
replacment fluid. Brake fluid is hygroscopic ie: it absorbs moisture 
from the air. If you don't regularly drive the car and heat up the 
fluid to drive out the moisture it will corrode the aluminum cylinder 
bores. If you go to Castrol "GTLMA" you can probobly go alot longer 
than 2 years but it is cheap insurance.
The reason your master cylinder is failing is common. The flush 
washed out all of the crud that helped seal the corroded bore. It is 
very likely that you will wind up rebuilding all 4 calipers also. If 
you have a 5 speed don't forget the clutch fluid which is the same and 
subject to the same problems. Many people have gone to silicone or dot 
5 but it isn't recommended for several reasons including, water won't 
mix with the silicone so if any is in the system it will eat up the 
cylinders.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxx, "Lynn Metz" <metzlynn@xxxx> wrote:
> Group:
> 
> I was just wondering why the owners manual suggests changing the 
brake fluid 
> so often and why so many list members emphasize this as well? Is 
this just 
> being extra careful or is it really needed. For example, my daily 
driver, 
> Firebird, has over 130,000 miles (12 years old)- brake fluid never 
changed - 
> never any problems. Now, I drained and replaced brake fluid this 
summer on 
> the DeLorean and now, about 300 miles later, the master is going 
out. I 
> assume the new fluid was too much for the old rubber in the master. 
(Or it 
> could be a coincidence)
> Brian 16584
> 
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