IMHO, the test strips cost almost as much as the fluid...….I flush my DOT 3/4 fluid vehicles every 3 years and DOT 5 annually..... and when I say flush, I'm talking just push a few ounces of fluid out...nothing more. DOT 3/4 doesn't absorb moisture....DOT 5 does.... the issue is more contamination and particulates generated from normal wear. My wifes car (purchased new in 1997) I replaced the caliper on it last year...yes, 20 years on OEM caliper assemblies...still no leaks and everything worked fine...just precautionary. My mustang (1965, been in the family since new), it has the DOT 5...… after the ground up rebuild I did in 1987, a couple of the wheel cylinders were sticking a bit....at 26 years old.....I replaced em.
IMHO, unless you are paying a mechanic to do your oil changes, this IMHO should be nothing more than a routine service item that everyone can do themselves if they choose. flushing the system routinely is nothing new....it was considered "industry standard" back when I was workig my way through school at a "real gas station"...……..you actually pumped gas, installed tires, repaired engines, etc.
Member: Never trust a person over 40 who drives a Chevy club
Flatheads ain't so bad!
Certified backyard mechanic I & II