I have an e36 and i was goin home and i took this one turn that i always take pretty fast, but i didnt touch the brakes. After i cleared the turn the light cam on (its the one with the circle and three dashes on eather side). The other wierd thing is that the screachers (things that sound like you forgot to put brake pads in) arent making noise...and sometimes the light goes out.
What could it be...
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