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Here we can compare the vast difference in caliper mass, piston volume, and swept area of the stock GM D52 single-piston caliper (above), and the Baer T4. Note how the Baer T4 caliper has different sized pistons; the leading piston is the smaller one, which allows even pressure and pad wear. This maximizes pad life and reduces distortion on the pad backing plate. The T4 caliper uses the same OE pad size as a '98-02 Camaro, so you can get replacement pads anywhere.