

2. Protecting Against Contamination Wheel oil seals act as barriers against external contaminants. Dust, dirt, and moisture can enter wheel assemblies if seals fail, leading to corrosion and degradation of components. Keeping these harmful agents at bay is essential for maintaining the health of the vehicle.
A typical drum brake line diagram illustrates several key components the brake drum, brake shoes, wheel cylinder, and the hardware kit, which includes springs and levers. The brake drum is a cylindrical component that rotates with the wheel. When the brake pedal is pressed, hydraulic pressure is generated in the brake line, pushing the piston in the wheel cylinder. This action causes the brake shoes to expand outward against the inner surface of the drum, creating friction that slows down or stops the vehicle.