The front to rear braking bias is controlled by a proportioning valve system, which normally is heavily biased to the front to prevent rear brake lock up. Testing of the bias is normally done with some very high pressure (3,000 psig) specialty gauges, not something everyone has. The valve system is not adjustable, so if it is off it has to be replaced. On the early cars (ABS/TC), the valve is separate, on later cars (ABS/PSM), it is part of the stability management system.
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