Silly question, but are you pushing the brake down far enough when you use it? My wife was had a similar complaint to yours, but I found she wasn't pressing it down far enough for it to hold the vehicle? The brake only releases on the second push, so the first push should go down as far as you can get it to go, mine holds fine when used this way... hope that helps!! EDIT: I just re-read your post and that bit about the other Kluger holding fine suggests there could be something amiss with yours, but I don't know what!!