I always look at the jaws to confirm. I will admit I get complacent with the pull test sometimes. Depends on where I am. The reason to do a pull test is more than just confirming locked jaws. You are testing the brake system too. So I might not do a pull test when I'm leaving my own driveway. I'll know at the first stop sign if the brakes are working or not. I am more careful to do the pull test when leaving a campground and hitting the road, which more often that not is a downhill stretch. I want to feel the brakes.