DOT5 silicone brake fluid should not be mixed with DOT3, DOT4 or (interestingly) DOT5.1 fluid. If you switch from DOT5 to a glycol fluid like DOT3, you should thoroughly flush the brake system. Given that it sounds like it won't be long before you have to go completely through the brakes on your truck, I suppose it doesn't make much difference at this point.
I'm guessing the USPS went with DOT5 either to reduce maintenance (it doesn't absorb water) or because they thought it would perform better in the stop-start postal service driving.
I inadvertently put DOT4 fluid in the front brakes of my wife's Harley Sportster. (Harley uses DOT5 because it won't damage paint.) When I realized my mistake I flushed it out with DOT5. It was probably a coincidence that the master cylinder failed a year later.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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