Quote:
Originally Posted by The HACK
Huh. Must have missed this little nugget.
StopTECH BBKs have SMALLER Piston area than OEM piston surface areas. Go ahead. Look them up.
Piston area is calculated for each side that does the pushin', StopTECH front caliper kits are designed so that the two (if you're going with the 4 piston kit) pistons pushing on each pad totals up to a slightly smaller surface area than your OEM piston.
In fact, ANY BBK that sells you on a bigger overall piston area than stock should be SHOT (or at least not to be trusted). I once installed a 4 piston kit on someone's car. The overall piston sizes were LARGER in total than the OEM piston size. We "chased" a soft pedal for months and months and multiple bleed and flush of the system, until I consulted an expert on all things brakes and he immediately identified the soft, mushy pedal as a result of us installing larger than OEM piston surface area.
Sure enough, getting the right sized pistons (smaller) immediately firmed up the pedal to OEM and/or better feel.
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Agreed. Still, in our case the 328 and 335 master cylinders are the same part number, meaning that we shouldn't get a soft peal feel after retrofitting 335 brakes into a 328. Neither should we get a soft pedal feel after retrofitting BMW performance brakes or BBK's specifically designed for the 328, as these kits are designed to work with the stock master cylinder specs.