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The CV boots are protective rubber boots that cover the flexible ends of the drive axles. The boot has a large end and a small end and looks sort of like an “accordion funnel”. The boot prevents the grease from drying out. But most importantly, a properly functioning boot prevents contaminants like dirt and grit from integrating with the lubricant to create an abrasive mixture that accelerates part failure.
Modern front wheel drive cars typically combine the transmission and front axle into a single unit called a transaxle. The drive axle is a split axle with a differential and universal joints between the two half axles. Each half axle connects to the wheel by use of a constant velocity (CV) joint which allows the wheel assembly to move freely vertically as well as to pivot when making turns. A CV boot is used to protect the CV joint and prevent the grease from drying out and more importantly it keeps dirt and grit from getting in.CV