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Does your car have antilock brakes? If so you may have a malfunctioning sensor that is causing the wheel to lock. Have the vehicle scanned with an ABS capable scanner to see if there are any codes. If you do not have ABS the issue could be due to a bad brake line that is causing the fluid to stay in the system too long when you release the brake pedal and causing the wheel to lock. This can also be the cause with ABS!