Gabriel wants to emphasize the importance of renewing damaged or missing strut cushions (bump rubbers). Damaged or missing strut cushions that are not replaced during strut and cartridge fitments can cause premature strut failure.
A strut cushion consists of a convoluted rubber boot or gaiter and a urethane compression bumper. These fit together and slide over the piston rod to rest on the strut’s body.
The gaiter protects the strut’s chrome piston rod from damage, keeps dirt out of the seal, pitting from stone chippings and corrosion from whatever the road may throw up.
The compression bumper, which fits into the boot, avoids internal damage being caused by preventing metal-to metal contact under severe compression of the piston rod.