Mercedes says the older pre 1992 cars need the fluid flushed every year. I do all of mine ever 2, or as needed with component replacement. From my owner's manual:



When I did the fluid on my sister's grand prix (which was 6 years old at the time? the fluid was original.) the fluid that came out was black, and the brakes felt much better afterwords. And GM says it's a lifetime fluid

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

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

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

They say that about tranny fluid and coolant, too. Remember the big class action settlement about 'Death Cool?'

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!