I'd say the 'normal' mode of operation for most people is to simply wait until some brake component fails, forcing the matter of a flush. Heck, many treat their gearboxes and transmissions, and cooling systems like that too. I'd say at least most folks are aware of motor oil changes...

The thing is, given a reasonable flushing interval, brake components can last indefinitely.

IMO, the flush will save you money in the long run, and keep you ON that mountain road...

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1986 300E 5-Speed 240k mi.