Quote:
Originally Posted by ZInferno0248
So, to clarify... You are saying that the four-piston rear kit that AP sells has different piston bore sizes that are engineered to balance with the 6 piston fronts? The actual pistons themselves (on the 4-piston AP rear calipers) are smaller internally than the 4-piston stock fronts?
If this is the case, does it mean that the rear wheels would lock up sooner or harder than they should under braking because the calipers would clamp too hard or too quickly?
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Question 1: Yea, that's the usual way they balance the system.
Question 2: Yea, rear lock up would be a huge problem.
A drum parking brake is built in to the rear rotors not the rear calipers, so the rear rotors would need to be retained. Unfortunately, the rear rotors are substantially thinner than the front rotors so pad and piston retention could be a serious problem.
Sell your OEM brakes and save your money for a BBK for the rear. You'll get a a matched system not a huge headache from a home made system. I had front and rear BBK's on my 04 GTO, well worth it on looks alone.