Pronunciation: [dɹˈʌm bɹˈe͡ɪk] (IPA) 
Drum brake is a type of braking system used in vehicles. The spelling of this word can be explained using the IPA phonetic transcription. The "dr" sound is pronounced as /d/ and /r/ together, while the "u" sound is pronounced as /ʌ/. The "m" sound is pronounced as /m/, and the "b" sound is pronounced as /b/. The final "r" sound is pronounced as /r/ again. Thus, the phonetic transcription for "drum brake" is /drʌm breɪk/.
A drum brake is a type of braking system commonly used in vehicles, particularly in older or heavier vehicles such as trucks, buses, and some cars. It is a mechanical device that slows down or stops the rotation of the wheels.
The drum brake consists of a metal drum, usually made of cast iron, attached to the wheel. Inside the drum, there are two semicircular brake shoes lined with friction material, known as brake linings. The brake shoes are connected to a mechanical linkage and are pushed outward when the brakes are applied.
When the driver applies pressure to the brake pedal, the hydraulic pressure from the master cylinder is transmitted to the wheel cylinders, causing them to expand. This movement of the wheel cylinders forces the brake shoes against the inner surface of the drum, creating friction and slowing down the rotation of the wheel.
The primary advantage of drum brakes is their ability to withstand heat better than other types of brakes, making them ideal for heavy-duty applications. Additionally, they are less prone to contamination from water, dirt, or debris, ensuring consistent braking performance.
However, drum brakes have drawbacks compared to modern disc brake systems. They tend to be less effective at dissipating heat and can experience fading during prolonged and heavy braking. Moreover, they require manual adjustment to maintain optimal brake performance, unlike self-adjusting disc brakes. Despite these drawbacks, drum brakes continue to be used in certain vehicles due to their cost-effectiveness and durability.
The word "drum brake" comes from the combination of two components: "drum" and "brake".
The term "drum" refers to the design of the brake system. Inside the brake drum, there is a hollow cylinder-shaped component that rotates along with the wheel. This drum provides space for the other brake components, such as brake shoes and pistons, to be housed and operate.
The word "brake" refers to the device used to slow down or stop the rotation of the wheel. The term "brake" has its roots in Old English, with some sources tracing it back to the Proto-Germanic word "brekanan" meaning "to break" or "to shatter".
