hydraulic cylinder seals and wipers
The hub axle seal's primary function is to keep the axle lubricated. The lubricant, often a type of grease or oil, is crucial for reducing friction between moving parts. Without proper lubrication, the components can suffer from overheating and excessive wear, potentially leading to significant damage and costly repairs. Additionally, the seal prevents water and dirt from entering the axle assembly, which can cause rust and corrosion, further jeopardizing the integrity of the axle.
Un'altra caratteristica distintiva dei freni a tamburo semi è la loro capacità di fornire una forza frenante costante anche in situazioni di emergenza. Questa affidabilità è cruciale, poiché consente ai conducenti di mantenere il controllo del veicolo, riducendo il rischio di incidenti. Inoltre, i freni a tamburo sono noti per la loro lunga durata, il che riduce la necessità di interventi di manutenzione frequenti. Ciò si traduce in un risparmio economico sia per le aziende di trasporto che per i singoli conducenti.
semi brakes and drums

The wheel cylinder is central to the operation of drum brakes. It contains two pistons—one for each brake shoe. As hydraulic fluid enters the expanded wheel cylinder, it pushes the pistons outward, causing the shoes to press against the drum. Understanding this mechanism is crucial for diagnosing problems; if one side of the cylinder fails, it can lead to uneven braking and potential safety hazards.
drum brake line diagram
