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if we take the example of touring cars (BTC, Aussie V8) then they are front engined with the fuel tank in the rear. On full tanks the weight is more balanced front to rear (as an example), so under cornering, braking etc a certain amount of weight transfer takes place. As the fuel comes off less weight is at the rear, so less weight transfer takes place. To make the most use of the tyres, mainly the fronts, the brake balance is moved forward as more weight is took off the car, as less weight transfer means the loads on the front tyres change. This means you can brake later etc.
The effect of having too much balance to the front still means you lock the fronts first and understeer off, and too much balance to the rear means the rear of the car is trying to over take the front, like an oversteer effect. If it is a wet surface then more rear brake is applied to stop the fronts locking in the slippier conditions.
Hope that helps a bit.
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