my abs is weird it seems like it snow and dirt. Not sure if there is just slush or dirt getting in the rotors when I brake or what. Just doing some hard braking in these condtions and it seems like i get the lock of all lock ups and loose all ability to brake. Is this normal for 4wheel abs? And my frontier has 17,000 miles on it and this is by far the worst vehicle brakes i have owned, is anyone else like this? Spongy pedal to the floor?