auto tech: noisy brakes require mechanic\'s attention
Hey, time traveler! This article is published at 14/6/12 (2543 days ago) Therefore, the information in it may no longer be up to date. Safe parking is the most important of all possible vehicle problems. The noise from our brakes is a warning signal that every driver should pay attention. This may be a minor problem, but it may also be a serious security issue. You may have heard the squeaking of the car\'s brakes. This noise can be found on many cars traveling on the road today, and the driver has spent a lot of time and money trying to correct this noise. To correct this problem, a thorough brake overhaul is sometimes performed. This usually includes replacing the brake pads on the disc brake and the brake shoes on the drum braketype brakes. Friction surface of metal brake drum and rotor ( The part where the brake pads hold) It is also often processed to provide a flat and smooth surface as brake friction material. Although the brakes may work well, sometimes the Scream will come back soon. The squeak from the disc brake is caused by the brake pads vibrating at a very high frequency on their supports when the brake rotor slides out. Noise can be compared to someone sliding their nails off the blackboard; The most unpleasant voice When stopping and gently stepping down the brake pedal, the squeaking or screaming is usually there. Noise should stop when parking quickly or pressing the brake pedal hard. If the noise is loud and stable and the car is driving all the time, there is a problem with the brakes. It may be a rock stuck in the brake mechanism, or it may be a brake caliper caught or worn, or some manufacturers have a metal wear indicator that contacts the rotor and squeak, tell you the brake pads are worn out. Vehicles with constant noise should be checked by the brake specialist as soon as possible. The brake pad material causes intermittent creaking. In the past, the brake friction material was made of asbestos. It stops very well and is quiet, but the dust generated is very harmful to our lungs. Today, this material can be divided into organic or metal materials. Brake pads made of organic materials are often quiet, but wear faster and are not suitable for places where the brakes are severely used. The metal lining is used in places where serious braking conditions are encountered and high braking heat is generated. Metal materials provide better braking performance under intense and repetitive braking and can last longer, but will produce more noise such as creaking and creaking. The manufacturer will use these two brake friction materials on the car according to the expected or recommended use of the vehicle. Replacing the brake pads made of organic materials with brake pads made of metal materials can cause the brakes to squeak. The manufacturer carefully selects the brake pad material of the original equipment to reduce noise and improve durability. After-sales brake pads may stop like the original ones, but sometimes cause noise because they may not be able to best match the material of the rotor. It\'s almost impossible to stop all the brakes squeaking, and most manufacturers say in their manual that some brakes squeaking is normal. However, there are some ways to reduce the noise. Some manufacturers use stainless steel The steel gaskets at the back of the pad can change the vibration frequency of the brake pads and stop screaming, but these pads are not often added to \"non-flashing\" vehicles. The other reason the brakes squeak is because the installed brake pads are loose. Sometimes metal cards can be bent to tighten the brake pads. Other times, the brake pads become loose due to the wear of the brake caliper positioning surface. Replacing the brake caliper is the only way to solve this problem. Creaking noise can sometimes be reduced or eliminated by applying anti-noise on the back of the linerSqueaky material Brake Parts manufacturers sell several types of materials. Some are like silicone rubber, which pads the brake pads on the brake tongs so that the brake pads do not vibrate. Other types of materials, like lubricants, allow the liner to vibrate without creaking. Do not use ordinary grease to lubricate the back of the liner. The heat from your brakes will burn it off soon! Finally, polishing the brake pads helps reduce creaking and improve braking performance. Sanding includes heating the pad to high temperature, burning the glaze on the pad and mounting the pad to the rotor. This is done by driving the car at a speed of about 70 to 80 kilometers and then braking to stop with a medium to firm brake force. Repeat stops about 10 times, allowing a complete stop The minute cooling time between stops to avoid overheating of the brakes. Of course, this procedure must be completed in the case of safety and trafficfree place. If you feel uncomfortable doing so, your local brake specialist will be happy to help you. Jim Kerr is an experienced mechanic, a lecturer in automotive technology, a freelance journalist and a member of the Canadian Association of automotive journalists. kerr. jim@sasktel.