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How a Seatbelt Works and When to Replace It
Model: (Various brands) Various
Seatbelts are designed to prevent us from being thrown out of the windscreen, restraining the torso and pelvis, two of the largest and strongest cages in our body. The belt tightens around the person when necessary, while under normal conditions, it allows for some freedom of movement. The video clearly shows how the various winding and release mechanisms work, and the important function of the pretensioner, which applies more force the higher the vehicle's speed during impact. When should they be replaced? At the centre of the mechanism, there is a torsion bar. If the bar twists irreparably and if the slightly elastic fabric of the belt deforms, that is the time to replace the seatbelts. Therefore, after a serious accident.
Updated on 31 July 2026 by ScegliAuto
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