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This certainly is not normal! In fact, the front disc/ rear drum system should actuate the rear brakes before the front! That in effect prevents the “nose dive” effect of the front-end. Several things could be causing what you described
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You're right I forgot about that, been a while since I took my brakes class.
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Next, check the front pads & rotors. Do not, and I repeat, DO NOT use Duralast rotors & pads on the front of these cars! They simply will not handle the demand of weight & speed. 
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http://www.automotiveforums.com/vbul...d.php?t=900995
I learned my lesson on that already. Bendix pads and Wagner quiet stop brakes.
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1) Rear shoe adjustment to tight.
2) Rear drums turned with a rough surface.
3) Malfunction, or blockage of the portioning valve.
4) Mismatched shoe/drum configuration.
5) Front pads & rotors that are not up to the task!
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I'm thinking 1,3&4 as possible suspects. Replaced The rear drums when I did the shoes. But the shoes are duralast. Also with the portioning valve, isn't it setup on the park avenue as a combination valve (proportion/metering) valve with the master cylinder?
If this is the case does that means that I need to change the master cylinder.
I also need to change out the ABS pump it doesn't work. Used a Tech 2 at school awhile ago and there was a short in the LF solenoid circuit.