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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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