That is what is required to bring a moving vehicle safely to a halt. Rainwater and damp weather make surfaces more slippery. Understanding the concept behind each of these two statements will help you to understand the adverse effects that damp weather can have on your car’s braking ability.
ROTOR AND DRUM SURFACE
One area in which water and damp weather will adversely affect rotor and drum surfaces (and braking ability) is anti-parallelism, warpage, cracking, and out-of-roundness. Long after the storm has passed, standing water on the roadway can create problems that affect your ability to brake effectively. When (and because) brake rotors and drums are extremely hot, contact with cool water may cause them to warp or crack in a variety of ways. Where brake rotors are concerned, variations in surface parallelism that exceed maximum allowable specifications will cause brake pulsations that are felt and seen in the steering wheel.
Where damp weather and rain affect your vehicle’s braking ability the most actually has nothing to do with the brake system. Water, and especially standing water, on the roadway can affect your car’s ability to brake safely more than any other non-mechanical factor. Tires are your first line of defense against this wet hazard of the road. Tire maintenance and making sure that you have tires with sufficient tread and the correct amount of air pressure are critical to your braking ability in damp weather. When scheduling tire maintenance, add windshield wiper blade replacement. A good set of wiper blades can go a long way towards a safe drive.
Finally, let’s talk driving habits. Often the weakest link in the braking system is found between the steering wheel and the driver’s seat. Distraction is the enemy of safe driving. This is especially true in damp weather. Allow more distance for braking when the road surfaces are wet and dramatically increase the braking ability of your automobile. Avoid driving through standing water when your brakes are hot and you may avoid brake pulsation and the expense of premature rotor and drum replacement.DEL2