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Brake Fluid -- dot 4 200

posted by  scorch on  Sat Jan 31 11:50 CST 2004
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In fact one of the prime recommendations about Castrol LMA brake fluid is it's resistance to absorbing moisture.

As I understand the Castrol product, it is the LMA rating (LMA=Low Moisture Accumulation) that addresses that issue, and not the Department of Transportations specifications for DOT 4, which was the poster's original question. Sorry for the confusion. The DOT 4 spec refers to a higher boiling point, irrespective of moisture accumulation.

Second, Girling specifically isued a bulletin while I owned my Saab 99 about not using Dot3 brake fluid because it could attack the seals in the system.

I've never heard of such a warning. Again, going by the DOT specs, and the formulations of manufacturers, I can't understand why that would be since the formulations (the difference in one brand of DOT 3 and the same brand of DOT 4) are practically identical. But I'm not going to argue with Girling, or you. I stand corrected.

Third, I'd never heard of Dot5 brake fluid causing such damage to seals, I wouldn't use it anyway.

I've read this warning in a few different sources.






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