Sorry, LopSae, cannot agree with you. However, I consider braking to be one of the most important functions on the bike and I simply cannot accept such reliability. When you squeeze the hydraulic brake levers, a piston pushes hydraulic fluid from the master cylinder into the fluid-filled brake line. On a car, the plier-like device is called a caliper which is roughly the size of your hand and is activated by hydraulic pressure and the rubber blocks are replaced by pads with harder friction material that fit inside the calipers. Even with the extra cooling fins, on a long descent, the brake may overheat, and may catastrophically fail. On a car with disc brakes, you can often see the shiny, silver-colored disc by looking through the wheel. Method of Braking Both drum brakes and disc brakes use hydraulic mechanisms to generate braking force. How to increase the brake force of my drum brakes. Let's say I will be going 50 km/h with total mass of 110kg. . Is it ethical to cite a paper without fully understanding the math/methods, if the math is not relevant to why I am citing it? Band brakes have been in existence for a long time and are prevalent in countries with wet weather. The reaction arm (at left in the photo below) must be securely attached to the left chainstay or fork blade. I read that Shimano used a brake lever with the pull of cantilever brakes (short pull). Air flow Axle Cooling fins Heat can negatively impact brake function. Eventually, they become too thin to function properly. Fit 14-1/2" to 16-1/2" wheels. The lever must be able to pull at least 14.5 mm of cable. Drum return springs (which pull the shoes away from the inside of the drums when the brakes are released) become worn, stretched or broken, which can cause the brakes to drag. This causes friction, which slows the vehicle (and creates heat). If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. It plays a vital role in the engines operation and, Jay Girnari 2023 Engineeringchoice.com. At the same time, disc brakes cannot be used as parking brakes because they expand when hot and contract when cold. When shoes press on the outside of the drum, it is usually called a clasp brake. The term drum brake usually means a brake in which shoes press on the inner surface of the drum. Because heat-dissipating area is smaller than with rim brakes, these brakes run hot -- but some are designed to. Welcome to the site, and I look forward to your future contributions. Again: the cable to a front hub brake must run down the fork blade inside a cable housing.