brake fluid as coolant? (car question)

[Stalk]

Young Stalk had his brake fluid run low due to lax maintenance and explained to me that he had put 600 ml of fluid in and the light was still on. Pulled all the wheels of for him and found no leaks. Asked him where he put the fluid and he points at the coolant expansion bottle. He feels suitably stupid.
Question is, can I expect any adverse reaction from that amount of brake fluid in the coolant?

Cheers,
Stalk

[Fisty]

To be safe I would drain and flush the coolant, then refill.
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[CaNsA]

[stonesie]

[Aff]

Wont do any good for the seals. I would get it out and give it a good flush.

Has it gone all milky? 600ml is quite a lot.
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[G]

Has it actually been run since?

If not, it should be limited to the expansion bottle. At this time of year, depending on the engine and use, quite possible the expansion bottle won't be used anyway.

[Llama-Farmer]

[SQL]

Are brake seals not rubber drain it and replace it with de-ionized water/coolant/antifreeze

[Ste]

[CaNsA]

[stevo as b4]

Feck the brakes, and worry about your cooling system. You need to be warm in winter, and few people these days take care of their car's cooling system or do the specified interval coolant changes etc.

This is why there's a lot of people in winter, sat in car's cold with blocked heater matrix's air locks in the system, blocked rads, and corroded coolant pipework, leaks, and knackered water pumps.

I've seen some extreme pics of where engine waterways in head's and blocks have corroded away and crumbled/collapsed in extreme cases. You don't want the insides of your car's coolant system to look like an outboard motor that's been run in saltwater for 10years!

[Llama-Farmer]

[Robby]

Inside a cooling system you will find aluminium alloy, steel, and rubber operating over a wide range of temperatures.

Inside a braking system you will find aluminium alloy, steel, and rubber operating over a wide range of temperatures.

Brake fluid is not going to eat your engine. It may react with the coolant and turn into jelly.

Drain the coolant, refill with water, run up to temp. Drain again, refill with coolant, job done.

[_Iain_]

My concern would be the effect on parts like the thermostat, and the various sensors.
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[Llama-Farmer]

[Tamsin]

I definately agree with LLama

its not even a particularly difficult job in most cars so why take the risk