2005 Commercial Driver’s License Manual Make a test stop when safe to do so. Check behind to make sure no one is following, then apply the brakes to be sure they work well. If not, dry them out further as described above. CAUTION Do not apply too much brake pressure and accelerator at the same time, or you can overheat brake drums and linings) 2.14 – Driving in Very Hot Weather 2.14.1 – Vehicle Checks Do a normal Vehicle inspection, but pay special attention to the following items. Tires. Check the tire mounting and air pressure. Inspect the tires every two hours or every 100 miles when driving in very hot weather. Air pressure increases with temperature. Do not let air out or the pressure will be too low when the tires cool off. If a tire is too hot to touch, remain stopped until the tire cools off. Otherwise the tire may blowout or catch fire.