There was something else going on to cause this. Even though the biscuit spare isn't the same width and possibly low pressure, that should never have activated DSC to keep that caliper engaged enough to cause this to happen.

The standard for the system with different diameter tires/wheels is +/- 3% diameter between the set. Even with low pressure in the tire (unless completely flat), it wouldn't be in excess of that variant.

Yes, a fault in the DSC (not because of the tires) could have initiated a braking on that one caliper or simply the caliper was not releasing properly. Either way, its needing to be found and resolved.

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'01 740i Sport MKIV, Quad Brake Lights, Bi-Xenon retrofit, HID Fogs Dinan 7 Struts, Springs, camber plates, Intake, MAF, CAI, Throttle Body, NBT Retrofit, Strong Strut


'99 318ti Titanium Silver; '97 318ti Boston Green; '13 X5 3.5i Saphire Black Metallic
'84 633csi Black (sold); '88 325iC Black (sold); '97 740iL Black(sold); '01 740iS Black (sold);'97 318ti White (sold); '08 X5 4.8i Titanium Silver (sold); '96 318ti Alaska Blue (sold)