hi, hope im doing this right, i have a question , i have a freelander its my first 4 wheel drive so please forgive me if i sound stupid ha ha, as i was driving in the snow and ice this morning, i was coming up to a roundabout on a well used main road and only doing about 10mph as i had slowed right down , when i pressed my break it made a crunshing noise and went hard and the car carried on going, it wouldnt stop! is this normal?? my breaks work fine the rest of the time, it is a freelander xedi s wagon. Thanks