My 09 versa makes a clunk when I apply the brakes, but only when I do the opposite of what I have been doing. So if I am going forward no noise when applying the breaks, but if I back up and apply the breaks I get a clunk in the front end. If I then go forward I then get the clunk but after the first clunk as long as I keep going in the same direction no clunk when breaks applied. Only when I change directions and then only for the first time the breaks are applied. Has anyone else had this problem? Is is serious? I have had no noise in the break system until now at 49k Thanks.