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rear brake upgrade

Brakes

Vehicle Information: Model: C2; Year: 1990; Body Type: Coupe; Engine (type, size, modifications): 3.6 l stock; Total Mileage: 140,xxx;

I recently replaced my stock 2 piston rear calipers (1990) with used stock 1992 4 piston rear calipers. My question(s): do I need to change the brake bias valve? If so, what is the part #, and where (in the brake system) is it located? I own the PET program and have been through the drawings/parts lists several times and can't locate it. Thank you.

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