If it was a 320, temperatures in this region are not that standard. According our AOM, you should be prepared for deflation if they go above 800°. Okham Hold mentioned a good point with taxi in such vis.
It would also be interesting whether you had these temperatures on all 4 wheels (if we talk about a 320, but the abrupt brake application sounds like it..) or if it was on a single wheel. This might result from a stuck brake disk or the brake on this wheel might be worn down the most, resulting
in higher temps.