what is Drum Brakes..? -: Drum brakes So called because the braking part is drum- shaped. Inside the drum, two large, curved brake pads push outwards, slowing you down. Below is a picture of the inside of a drum brake, once the drum itself is removed. The drum itself is a relatively uninteresting, slightly rusty, dish- shaped lump of metal which the wheel bolts on to. The rim of the drum is about two inches deep, completely covering everything you can see in the picture. At the top of the picture is a slave cylinder which pushes the two brake pads outwards when you press the brake pedal. The pads rub against the inside of the drum, and the friction slows you down. Drum brakes are good because theyre simple (although not when youre trying to put them back together) and reliable. However, they have a couple of bad drawbacks: if you go through some water, they are very ineffective until the water has drained out of the drum; and they get less efficient as they get hot. When they get hot the drum expands, growing further away from the pads, so you have to press the pedal further down to get the same amount of braking, and if they get hot enough you get very little braking at all. This is very bad news if youre driving down the side of a mountain on a switchback road, and not much better if youve been thrashing it around some country roads and need to stop suddenly. what is Disc Brakes.....? Working somewhat like bicycle brakes, disc brakes work by using calipers to clamp brake pads against either side of the spinning disc. Disc brakes are good because when they warm up, the disc gets larger and is therefore closer to the pads, meaning you dont have to push as hard on the pedal to get good braking. Also if you drive through water, it just falls off the disc so you get your stopping power back very quickly. Theyre also generally more efficient than drum brakes and are easier to set up. You may hear about cross drilled disc brakes, this means they have small holes drilled through the face of the disc as in the picture above. The holes were originally designed to help remove gas caused by brake pads heating up, but with modern pads being much more resilient they are just there for show. diffrence between Disc brakes and drum brakes.. Disc brakes and drum brakes - two totally different designs that solve a problem. Car brake shoes are divided by the names of friction pairs: Shoe-disc and drum-drum. They have a problem, but different design. The first brakes appeared much earlier cars, still mounted on light carriages. Speeding the crew stopped the cart, or wooden shoes. With such a straightforward system of levers and wheels compress pads slowed their rotation. Disc brakes have a pair of friction pads and the disk is opened and the cooled counter flow of air. This is the main difference between the disc brakes and the drum brakes. Spinning disc clamped two pads and the wheel stops spinning. The advantage of this design is that the brake quickly cleaned of dirt and moisture. Drawback - rapid wear shoes, even the highest quality, compared to the drum system. In emergency braking, especially at high speed, there is strong heating disk. Often, the temperature reaches 600 degrees. To come up with better heat ventilated discs. The holes and grooves provide forced air circulation. For large loads or multiple pedals, brake pads coated with a thin layer of burnt friction material, which prevents effective inhibition. The grooves and slots ventilated disc cut carbon deposits, thereby renewing pads. If its rain and puddles all around, with a sudden stop at the wheel there are two elements: fire and water. For a hot disk it can end badly. In contrast to the hard disc brakes, a pair of drum brake shoe friction drum is hidden. The principle of operation is simple. Pistons are pushing the brake cylinder blocks and press them to the inner surface of the drum. Cool, this design is worse than the disk, no moving parts blowing counter-flow of air. Heat is removed through a special edge on the drum. Even the most advanced brake will not stop the car immediately. At a speed of 90 km / h braking distance is at least 30 meters. And it is on dry roads and a functioning system. If you have the slightest suspicion of a malfunctioning of the brakes, immediately contact the service. Since this is not joking. When the brakes are denied, you need to use their driving skills in order to minimize the damage.
Posted on: Sun, 26 Jan 2014 07:30:37 +0000