Just got my 2005 Mazda 6 back from the shop having a 90K service done to it. I am getting ready to go on a cross country trip with this car and went to check all fluids to be safe. My issue is the brake fluid cap. I took it off, checked fluid, then tried to replace the cap. Cap goes on but will not lock into place. I flipped the cap over to see if I was brain dumping on how it was supposed to go on. I looked at the cap lined up the indents on the resevoir but it still will not tread and lock. I tried it multiple times and ways. Is there a secret to this thing??