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Drum brakes consist of a cylindrical drum that rotates with the wheel, along with brake shoes located inside the drum. When the brake pedal is pressed, brake fluid is transferred from the master cylinder to the brake wheel cylinder, forcing the brake shoes outward against the inner surface of the drum. This process generates friction, which effectively slows down or stops the vehicle.

قبل از راه رفتن با خودرو، آن را چند بار ترمز کنید تا از عملکرد صحیح سیستم اطمینان حاصل کنید. در صورت مشاهده هر گونه مشکل، حتماً به تعمیرگاه مراجعه کنید.

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The drum brake assembly also includes a return spring that ensures the brake shoes retract to their original position once the brake pedal is released. This spring is vital for preventing drag, which can lead to premature wear and overheating of the brake components. Additionally, the brake system may incorporate adjusters that automatically compensate for wear of the brake shoes, maintaining optimal braking performance over time.

Recognizing the signs of brake drum wear is vital for vehicle safety. One of the most noticeable indicators is a decrease in braking efficiency. If the vehicle takes longer to stop or if the brakes feel less responsive, it could be a sign that the brake drums are worn. Other symptoms include unusual noises, such as grinding or squeaking, which may indicate that the brake shoes are making direct contact with the drum due to insufficient material. Vibration or pulsation when braking can also point to warped drums, necessitating immediate attention.

Once everything is reassembled, reinstall the wheels and lower the vehicle. Before hitting the road, pump the brake pedal several times to ensure the pads seat correctly against the rotor. It’s advisable to test drive in a safe area and gradually get accustomed to the new braking system.

How to Measure a Drum Brake

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