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You yourself shouldn't have to bleed the brakes, the dealer should take car of that. Trying to understand what you mean, "rear wheel cyclinders". I'm assuming they're rear drumb breaks and the slave cylinders are leaking. If thats the case, they were more than likely damaged from the accident. There is a lemon law that states if a car has the same problem 3 times in a certain time period (which i forget) the dealer has to provide you a new car on request. Something along those lines. I have a list of car manufacturers with warranty issues per customer, hyundai is towards the bottom (with more issues per vehicle per customer) Your pads being that low to not turn on the brake lights? Sounds shady, I don't if your car runs this, but a lot of cars just run a switch that detects pressure in the brake lines. Did you have an idiot light come on in the dash stating something wrong with your brakes? Let them switch your pads, (which i would think should last more than 40k miles) but if that doesn't fix the problem, raise hell...