If you have an awd light coming on then you have an awd transmission(car).if the brake pedal is pulsing while pushing on it to come to a stop then it sounds like the rotors are warped and need replacing.this can be caused by alot of heat build up on the rotors,a lot of miles on them,the wheel nuts were not torqued when tightened,rotors are rusting and coming apart,a loose brake pad moving around.get the brakes checked.
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