Started her up this morning, warmed her up for a few moments and then set off (her being a 2000 156. Handbrake had frozen, especially the left rear. Has happened before in the snow before Christmas but normally came right after a mile or 2. This morning my abs warning light came on after no more than 30 yards. Kept going (20 miles an hour) but it was still sticking. Pulled over after a couple miles only to be greeted by the smell of burning breaks from the left rear. Let it cool down and then carried on. Breaks seemed to come right but abs warning light still on. Was -9 by us last night and currently -2 just after lunch. Seen some other threads suggesting not parking in freezing temps with the handbreak on so have parked her at work with the handbreak off. Went to see her a few moments ago, started up but abs light still on. Is this anything i should worry about?