Disc brakes vs. drum brakes: What they are, how they work, which is better
Brake technology, just like suspension technology and fuel-system technology, has come a long way in recent years. One of the first steps taken to improve braking came in the early ’70s when manufacturers, on a widespread scale, switched from drum to disc brakes. Here is an article that explains the difference between disc brakes vs. drum brakes, what they are, how they work, which is better.
What are disc brakes?
Disc brakes ( click link for photograph ), sometimes spelled as “ dis k ” brakes, use a flat, discoid metallic element rotor that spins with the wheel. When the brakes are applied, a caliper squeezes the brake pads against the disk ( good as you would stop a spin phonograph record by squeezing it between your fingers ), slowing the wheel .
What are drum brakes?
Drum brakes ( click connect for photograph ) use a wide cylinder that is open at the spinal column, exchangeable in appearance to, well, a drum. When the driver steps on the brake pedal, curved shoes located inside the drum are pushed outwards, rubbing against the inside of the drum and slowing the bicycle.
What is the difference between disc brakes and drum brakes?
Disc brakes are generally considered superior to drum brakes for several reasons. First, they dissipate inflame better ( brake study by converting motion department of energy to heat department of energy ). Under severe use, such as repeated hard stops or riding the brakes down a retentive slope, phonograph record brakes take longer to lose potency ( a condition known as brake evanesce ). Disc brakes besides perform better in wet weather, because centrifugal force tends to fling water off the brake disk and keep it dry, whereas drum brakes will collect some water on the inside surface where the brake shoes contact the drums.
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Why do so many cars still use rear drum brakes?
All cars sold in the United States use phonograph record brakes for the presence wheels, but many cars still use drum brakes in the raise. Braking causes the car ’ south weight to shift ahead, and as a consequence about 70 % of the function is done by the movement brakes. ( That ’ s why your front brakes tend to wear out fast. ) By fitting phonograph record brakes to the front wheels and cram brakes to the raise wheels, manufacturers can provide most of the benefits of disk brakes while lowering costs. ( Drum brakes are less expensive to make than disk brakes, largely because they can besides double as a park bracken, whereas phonograph record brakes require a separate parking brake mechanism. ) even so, a car with four-wheel disk brakes ( versus front disc/rear drum ) will even provide superior braking performance in wet weather and on long downgrades. ( That said, you should always downshift and let the locomotive see the car ’ s amphetamine on long downgrades. )
How can I tell if my car has disc brakes or drum brakes?
If your car was built in the last thirty years, it most probable has disc brakes on the front wheels, but it may have drums in the rear. If the car has wheels with big openings, you may be able to see some or all of the brake assembly. Seen through the wheels, phonograph record brakes look like this, with a flat rotor set back from the inside surface of the wheel and a wide patch ( the caliper ) at the battlefront or rear of the phonograph record. Drum brakes look like this, with a cylindrical drum that is normally flush against the inside surface of the wheel .