dang. your brake reservoir looks clean like brand new. its so white. lol

 

I would be seriously concerned if this happened to my car.
And I'm as serious as can be, we're talking brakes.

Until now I only worked with the glycol based brake fluids.
If you get some on your hand / fingers it feels "not smooth" not like oil, not greasy - if you know what I mean.
Can you get a sample of the old fluid?
You can compare it with the fresh fluid you have.

If there is a noticable difference = bad!
Someone may have used a DOT 5 fluid in your brake system.
Or, in any case, a fluid that is not compatible with DOT 3, 4 or 5.1 fluids.
Maybe regular hydraulic fluid.

This fluid is now in your ABS unit, where it will be difficult - if not impossible - to remove.

How do the brakes feel?
As firm as they did before?

 

It's not clean. The photo is just overexposed from pushing +2 EV in post.

Brakes felt great before. Still feel great now. There were only a few drops of the floating yellow fluid. I used a turkey baster to siphon out the old fluid and then used a towel to clean out the reservoir. I didn't notice the floating yellow fluid until after I bled the first caliper and then I was able to suck most of it out. I refilled and bled the next. When it was low again, I siphoned out the rest of the specs so now it's clean.

I doubt someone put DOT 5 in there. I believe that the car was pretty well maintained. My clutch and brake fluids were pretty clean. Even my cabin air filter was clean.

 

When I do the ATE blue change over, there is always a touch of factory brake fluid left that cannot be removed. It mixes 100% with the blue and never has any little floaties

Dwight I think you have sone serious contamination there. But as with all internet pics, I could tell you more with the car in front of me.

 

Perhaps it came from my turkey baster that I used to suck out the old fluid.

Either way, I'm pretty sure that I sucked it all out. After each caliper I skimmed the top to suck it out before topping it off and moving on to the next caliper. By the time I was done with the last one, I didn't see anything before topping it off.

 

billman ftw!