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Routine maintenance of brake drums is essential for the safety of semi trucks. Drivers and fleet managers should regularly inspect the braking system, looking for signs of wear, such as grooves or cracks in the drum. A significant indicator of drum wear is a change in braking performance, such as vibrations, pulling to one side, or abnormal noises when braking.

Using a vernier caliper, measure the inside diameter of the brake drum. This is critical because the diameter must meet the specifications for the brake shoes to fit properly. Measure in several places around the drum to ensure accuracy, as wear can cause irregularities. Record the largest measurement.

Le maître-cylindre joue un rôle central dans tout le système de freinage. Il est responsable de la conversion de la force appliquée sur la pédale de frein en pression hydraulique, qui est ensuite transmise aux freins. Un maître-cylindre bien conçu assure un freinage uniforme et réactif, permettant une répartition adéquate de la force entre les freins avant et arrière. Sur les véhicules équipés de freins à disque à l'avant et à tambour à l'arrière, le maître-cylindre doit être soigneusement calibré pour assurer une performance optimale, évitant ainsi le déséquilibre lors du freinage.

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The primary components of self-energizing drum brakes include the brake drum, brake shoes, wheel cylinder, and various linkages. The brake drum, usually made of cast iron, rotates with the wheel, while the brake shoes are lined with a friction material that grips the drum when engaged. The wheel cylinder, located between the shoes, contains pistons that push the shoes outward when hydraulic pressure is applied.