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wraithorn
If I was to guess I would say that the brakes are faulty on your front wheels. Cars have more braking power going to the front wheels for good reason and when the brakes on the rear are working more than your front brakes then the rear of the car will tend to want to whip around to the front on bad roads because your traction is not as good on a bad road. That is a dangerous problem, you need to get it fixed so your car is predictable under braking.