wiedehopf’s link suggests otherwise, but I would have thought that routine cooling of brakes by pouring water on them (to reduce turnaround times?) is a highly questionable, and potentially very dangerous practice. (The thermal shock could cause them at best to distort, at worst to violently blow apart. The chap shown in the link has no protective gear at all whereas the firemen in the other link do.)
If the OP is talking about a small amount of water dripping around the brakes and landing gear, that is from the melting ice formed on metal cooled during the cruise freezing the moisture out of the air during the final desent. In particular, the underside of the wing gathers ice - on Airbus, under the inner fuel tank area at the wing root.
Last edited by Uplinker; 29th Nov 2017 at 11:44.
Reason: Typo