[Miata] Brake fluid change

[CHRISTOPHER ADAMS]

I use Motul in my track car. The correct boil points are 595F dry and  421F wet. Castrol SRF has by far the highest wet boiling point, but boy is it costly running about $70+ a liter. I'd need a faster car and sponsorship to run that stuff.

Chris A.

>>> "Mullen, Tim" <Tim.Mullen at ngc.com> 1/24/2007 10:55 AM >>>
glen mccready gkm+miata at petting-zoo.net wrote:
>
>> > How is it for boiling temperatures?
>>
>> They claim a dry-boiling point of 500 degrees.
>
> So, what's the wet boiling point? I bleed my brakes 
> more often than most, but after a few weeks wet matters, 
> dry doesn't.

I don't know.  They indicate that it's a low moisture absorbing fluid.
I would imagine that means that it's similar to Castrol LMA, which
doesn't have the highest dry boiling point, but has a pretty good wet
boiling point, and it last a long time before it actually gets "wet".

This is from a web site that I found that had some specs on it:

Fluid                       Dry BP   Wet BP
DOT 3 Specification           401      284 
DOT 4 Specification           446      311
DOT 5 Specification           500      346

Castrol SRF                   590      518
NEO Super DOT                 585      421
Motul Racing                  600      585
Motul DOT 5.1                 509      365
ATE Type 200/ATE Super Blue   536      392
Valvoline High Perf Synpower  513      333
ATE SL                        500      329 
Castrol LMA                   450      311



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Berck E. Nash flyboy at gmail.com wrote:
>
>>> Does it eat paint like ordinary fluid?
>> But I don't trust any brake fluid.  If I spill some (I'm very
>> careful not to), I wipe it up immediately and flush it with 
>> lots of water anyway.  Why take a chance?
>
> Yes, it eats paint.  Should I photograph my engine bay where 
> the paint below the master cylinder is gone from back when I 
> had a leak there?  I can also photograph the same spot on my 
> '62 F-100 where the master cylinder leaked onto the firewall, 
> you can see the missing/distorted paint.

Not disagreeing with you at all.  But apparently brake fluid doesn't
necessarily eat paint.  I've known people that have had no problems.
I've know people that intentionally have tested it had not had their
paint degrade.  I've also heard of people using brake fluid as a slow
pint striper.

Maybe it depends on the type of brake fluid and/or the type of paint.

But like I said, I don't trust the stuff on my paint.  I've seen similar
messed up paint below the brake cylinders myself.  I try very hard not
to spill, and if I do, I clean it up immediately before I find out
personally if it's going to damage my paint or not.  I would suggest
that everyone treat brake fluid as toxic to your paint.  :)


Tim Mullen
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