Every two years is the recommended interval and I believe that was
started by chrysler. But most dealerships will look at you funny when
you ask them to do it (and yes, you can do it yourself but it is a
hassle, especially with 4 wheel ABS). A buddy of mine took a 96 Ford
Probe he bought used to the dealer to have them flush the system and
they told him it didn't have to be done. He politely informed them it
was recommended by Ford right in his owners manual. Needless to say he
never went back there.
It's no different with or without ABS... unless you let the resevoir run
dry. First, siphon the fluid from the resevoir, and re-fill with fresh
fluid. Open up the right rear bleeder, and expel 1/4 of the total fluid
into a catch can. Re-fill the resevoir, and do the same to the left rear.
I do this with a hand-held vacuum pump, so it's a one-person operation.
Since I do it along with a tire rotation, and the wheels are already off,
the entire job takes about 15 minutes.
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