Hebei Hankai 30x47x7 oil seal

outer hub oil seal. Over time, the seal can wear out or become damaged due to exposure to extreme temperatures, moisture, and debris. If the seal is compromised, it should be replaced as soon as possible to avoid further damage to the wheel assembly.
In contrast, drum brakes utilize a cylindrical drum that rotates with the wheel. When activated, brake shoes inside the drum expand against its inner surface, creating friction to slow the vehicle down. Drum brakes are generally more compact and cost-effective to manufacture, which is why they’re often found in the rear brakes of economy vehicles. However, they tend to perform less effectively in adverse weather conditions and can suffer from brake fade during prolonged use due to overheating.
disc or drum brakes better

Bu sistemde dikkat çekici olan, fren balatalarının tambur iç yüzeyine temas ettiği sırada oluşan kuvvettir. Sürtünme kuvvetinin arttığı bu noktada, sistemin tasarımı sayesinde fren mekanizması, uygulanan hidráulik basınçla birlikte daha fazla frenleme kuvveti üretmektedir. Böylece, sürücü freni daha az kuvvetle kullanarak daha etkili bir frenleme sağlayabilir. Bu özellik, özellikle ağır yüklü araçlar için büyük avantajlar sunar.
self energizing drum brakes
