I live in germany and drive on the autobahn, so i went to the dealer and asked them to put in high performance brake fluid. Recently i checked my brake fluid level and noticed that the fluid is yellow color. I remembered that the brake fluid was supposed to be blue one. The dealership is saying the blue fluid is the racing fluid, and it is illigal to put it in a street car, so they put in ultra high performance fluid.

My question is: what are the downsides for using racing brake fluid (blue fluid) in a daily car? I do drive very fast on the autobahn and do high speed braking. Recently my rotors "warped", so i wonder if the brake fluid had anything to do with that and if i should fight with the dealer for putting in wrong fluid.

 

The ATE Blue is not allowed in the states, so it is a yellow color now. Many use Motul FBF 600 with great results, as long as its a quality DOT4 fluid you should be fine.

 

Plus the one bad down side is on this type of BRAKE FLUID IS JUST DONT GET IT ON ANY PAINTED PARTS. It will eat into the paint before you can get it off.

 

DOT4 is good, doesn't matter the color.
Ur warped rotor may have been from setting the parking brake before allowing rotor to cool. When I track the car, I do a cool down lap and park the car in gear(manual transmission) without setting parking brake.

 

Without knowing what they mean by "racing" brake fluid the OP's question is impossible to answer. If it's a silicone-based fluid, then they're right not to put it in a street car. Why? Moisture build-up.

Regular mineral fluid (e.g., DOT 3, 4 and 5.1) is hygroscopic. It absorbs moisture that gets into the brake system. This is bad, in that it lowers the boiling point of the fluid. But it's good, in that it keeps water from pooling in the brake system and causing brake components to rust (and another problem, see below).

Silicone brake fluid (DOT 5) is not hygroscopic. This is good for racing use, as there's less likely to be moisture in the brake system affecting the boiling point of the fluid. For street use, it's problematic, because eventually moisture will get into the system, and the water will settle in the lowest point of the brake system: the calipers. That's also where temps are highest, so water sitting behind the pistons will boil very early, causing loss of braking.

People who race and use DOT 5 [should] know to flush the brake system regularly to prevent this. Most street car owners won't change their fluid until something goes wrong.

Brake fluid has nothing to do with rotors warping. Did a mechanic actually measure run-out on the rotors to verify they're warped. Many, if not most, cases of "warped rotors" are nothing more than uneven build-up of brake pad material on the rotor.

The C7, I believe, uses a small drum brake inside at the rear hubs as a parking brake, not the disk brake, so putting the parking brake on shouldn't affect anything.

 

A GREAT article on Brake fluids.

http://www.advancepetro.com/differentbrakefluid.htm

I had Dot 5 in my '65 many years ago.
On a road trip through Montana we encountered some high (ish) elevations.
Guess what... no brakes at the summits !!!!!

 

Type of brake fluid and warped rotors are absolutely NOT related.

If the rotors are truly warped, it's because they were overheated.....most likely as a result of multiple high-speed braking actions where the rotors didn't have the opportunity to cool down.

KW