Here's a question for you. How long can brake fluid sit in an unsealed bottle before it becomes unusable?

The reason I ask this is because I replaced the brake fluid on one car last weekend and I want to do another car this weekend. I have about half of one of those 1 quart bottles of fluid left over from the last job that I'd like to re-use. It's been sitting in the bottle with the cap on all week and I'd hate to waste it.

I'm already familiar with the hygroscopic properties of glycol-based fluids and the warnings about always using fluid from a sealed container, so you don't have to explain that part to me again, thank you.

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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles