What is a brake drum?
The brake drum is a fragile gray cast iron material, similar to the iron casting of the tambourine, fixed to the tire and rotating at the same speed. When braking is required, the oil pressure pushes the brake shoe to contact the inner edge of the brake drum, and the friction generated by the contact rotates the tire to achieve the purpose of braking. The brake drum is not properly designed or easily deformed when heated, and the unbalanced force will also produce mechanical deformation, causing poor contact between the shoe and the drum, resulting in pedal force and stroke. Therefore, the brake drum should have sufficient wall thickness, and the outer surface near the opening of the cast circumferential or axial reinforcement to improve strength.