I try to do mine each year, sometimes things slip by a little. I use the Motive power flusher and works good, and has the cap that screws right on the MB resevor.
Brake fluid absorbs moisture and that will attack the the MC and other components. flushing the system will extend the life of the braking system and cut down on problems.
I always make sure the system is flushed before a GTG
.
If your fluid looks like coffee or mud, time to flush. should be clear like coming out of the bottle.
Sure GM has a life time brake fluid, probably last as long as some of their cars
.
Make sure to check the hoses on your power bleeder before using it. I had a sprinkler of brake fluid in top of the engine when I did mine last. I was under the rear bleeding a caliper, and the pressure dropped
.
so went back to pump it up some, and was confronted with brake fluid spraying all over
. hose cracked where it is clamped onto the body of sprayer.
Charlie