Dumb things that you did.......because you didn't know any better.

dano said

I flipped the inside brake pad on my 1990 Audi Coupe, put the metal part against the rotor. I was in a hurry. I couldn't understand why it make a horrible noise......oh......oops.

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Once when I was younger, I was running low on brake fluid so I decided to put transmission fluid in the brake reservoir. Everything seemed fine for a day or two, until the brakes started locking up one at a time. The transmission fluid swelled the rubber in the wheel cylinders. Yeah, I definitely learned a lesson from that one.