The bumper absorbs impact when the strut bottoms out over large bumps. The bellows (dust boot) protects the strut shaft from road debris, salt, and moisture that cause premature failure.

Absolutely. Worn bellows expose the strut shaft to contaminants, and cracked bumpers allow metal-to-metal contact during full compression. Always replace these protective components during strut service.

Installation requires removing the strut from the vehicle and compressing the spring to access the bumper and bellows. They slide over the strut shaft. Consider a complete strut assembly to avoid this step.

Rubber components degrade from heat cycling, UV exposure, and road chemicals. They typically need replacement every 50,000-80,000 miles or whenever struts are serviced.