My W212

I've noticed today that brake fluid in the reservoir turned blue. I clearly remember that the color was yellow when having done a fluid change in the MB dealer in December last year. Is that normal? Anyone has experienced that?

bmwpowere36m3

Brake fluid darkens with age, I’d call it a more molasses color after it’s been in service for a couple years.

S-Prihadi

ATE brand brake fluid is very dark blue. Maybe previous to your dealer replacing it last December, they never really flush it well and the old trace of blue ATE mixed with the yellow new fluid.
Dec 2020 to now is only 5 months max.

You just got this car last Dec ?

bmwpowere36m3

Good point, at least here in the US you can't get ATE "super blue" anymore (at least for a few years) and I doubt dealers/indys would use it. I used it during track days in the M3, switching between it and Typ200 which was amber. The super blue would stain the reservoir if left in service too long.

S-Prihadi

Ohh, you can't get ATE super blue anymore in the US ? Good info thanks BMW

My W212

Got this car in March 2020. The brake fluid was blue at that time. In Dec.2020, I took it to MB service center for replacing brake fluid. After replacement, it looks yellowish. Few days ago, I checked it again and found it changed to blue. Should I call the service center for the reason?

S-Prihadi

Okey dokey, so this is indeed a case of possible improper flushing of old blue fluid as I suspected or maybe traces of blue fluid from ABS module.
Honestly I do not know how much does an ABS module retains its old fluid due to its design albeit proper flush been done, but I believe it retain a little bit at least.

They need to do double flush to get rid of old blue brake fluid completely and that will take approx 1.8 liters.
What I mean of double flush is as follows, assuming your car is LEFT HAND DRIVE :

In the sequence as below ...... longest pipe line to shortest
Rear, right side brake, flush out 200cc >>> Rear, left side flush out 200cc >>> Front right/passenger flush out 200cc>>> Front left/driver flush out 200cc.
Do again one more round for above.
NOTE : If not based on cc ( volume), one can do based on seeing clear new brake fluid gushing out of all the bleeder valves.

If you want to claim to MB service center, I can't comment on that but I suppose it is a good try because it is worth a try.

Drive safe

My W212

Not optimistic to get brake line flush when having fluid replacement in MB service center. The invoice shows that only 0.6 liter was used (see attachment).
Just emailed to MB for the possible cause. Will update when having their reply.

S-Prihadi

W212, it is an easy DIY. Get the Motive brake fluid pump/bleeder kit suitable for MB cap. Get 2 liter MB original brake fluid.
https://www.motiveproducts.com/produ...dc713487&_ss=r

Watch how to use this kit and how to bleed, very easy, I promise you.

Find something to protect your paint near the brake fluid reservoir, cause brake fluid can eat thru paintwork.
No need to test how "wet" your brake fluid is with that pen thingy.

Google more about brake bleeding to get yourself comfortable.

Enjoy..........

Justin212121

Good day guys. I have the same problem. I dont know if it is a big problem butwhen i changed my brake fluid, the previous color was yellow and the new one was also yellow. But after a few min it turned blue

oldmots

I change brake fluid every three years. When I do, I rotate between Super Blue and standard clear fluid, that
way I will remember it has been changed. It is also easier to tell when the lines are changed to the fresh fluid by the color change during bleeding.

I do this my other vehicles as well. This is a pretty normal pro tech procedure, especially among racers.

Now that the DOT has ruled that brake fluid cannot be blue (so it won't be confused with blue coolant), Super Blue is history. Super blue was called Super due to its very high boiling point for racing.