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Well, i guess bias change in absence of brake torque dyno rig can be checked only very roughly, on eg. skidpad with switched off abs, when one end frequently locks up before the other, if it is similar to stock bias or not.
Safest way, if car is not running something like differently staggered tiresize or noticeably different aero downforce front/rear setup, or staggered brakepad choice, is simply to not perform any brake retrofit on one end, not designed for particular car or with particular specific other brakes on other in mind. Both cases, when brake bias deviates noticeably from stock, will introduce issues. Be it underbraking due one end locking much sooner and thus increased braking distances, be it stability loss due one end locking. It may matter less for one only daily driving theirs with all nannies on, never on grip limit, but if performance or sport or on reduced grip pavement (such as gravel roads or on snow/ice) driving is in mind, i wouldn't want braking subsystem be compromised.
From pic it looked as if you had essex apr fronts? AFAIK those were designed to keep brake bias stock if paired with stock rear brakes. As fronts are ones usually doing most braking, there won't be much lost if rears will stay stock, not heat capacity wise, not wear wise (eg. i usually wear front:rear pads as 2:1, which should illustrate little wear/heat put in rears). In your place i'd probably put stock rear brakes back instead of those STI ones.
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