Just my experience: my experimental amateur-built plane has Cleveland 6" wheels and brakes that came off of a certified aircraft. I choose to use the recommended and approved repair and replacement parts for them and I choose to use MIL-H-5606 aircraft brake fluid in my brake systems and it cost me $8.75 for a 32 ounce container from Aircraft Spruce. About 27 cents per ounce. Not automatic transmission fluid ($5.85 for a 4 oz container from Aircraft Spruce, or $1.46/oz), not DOT3 automotive brake fluid ($3.47 for a 12 oz container at Walmart or about 29 cents/oz), not DOT4 brake fluid ($7.97 for a 32 oz container or 25 cents/oz). I bought my 5606 fluid about 15 years ago and have completely drained and serviced my brake system three times for overhaul in that span of time because I choose to throw away a few ounces of well-used fluid when I overhaul the brakes.
The fluid came in a plastic quart bottle with reasonably airtight screw cap that was taped shut when received. The last time I serviced my brakes was this past summer and the fluid in the container was still fresh, clean, bright, and flowed freely when dispensed from the container. Unairworthy 5606 is a gooey, sticky, dark mess and when it's got crud in it you can see it. My fluid remains airworthy to my satisfaction, and I haven't even used half the bottle. I can't imagine why anyone flying our size airplanes would buy a gallon of the stuff or why they would worry about the cost of buying the proper aviation brake fluid for aviation brakes. And I can't imagine why you would throw it away if it's still in the original container, still appears and feels fresh, clean, bright, and still flows freely from the container. Oscar Zuniga Medford, OR Pietenpol Air Camper NX41CC Cont. A75 power
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