Please do not think that Dot 5 and 5.1 are related, they have very different chemistry.
Dot 3, 4 and 5.1 are glycol based fluids and are all hydroscopic, they are also not compatible with Buna-N or nitrile rubbers commonly found in mineral oil systems. Most of these brake systems utilize EPDM rubber parts.
Dot 5 fluid is silicone based which is hydrophobic, it has been around for a while but hasn’t been real popular, it has its own set of advantages/disadvantages. I can not comment on its compatibility with rubbers other than EPDM, but rubber/chemical compatibility charts suggest that it is compatible with Buna-N commonly used in mineral oil systems. I have not tested the theory yet.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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