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More than 90 percent of the passenger cars built in the last 10 years are equipped with rack and pinion steering and frontwheel driveline systems.
A leading cause of premature failure and costly repairs in these systems is deterioration of rubber or plastic boots used to protect their internal parts from moisture.
The number one enemy of these boots is exposure to gravel and to chemicals such as oil and power steering1 fluid. The older the vehicle becomes, the more likely it is to be affected by these factors.
Cold weather also has a deteriorating effect on the rubber compounds used in some boot brands. Some boots on the market will crack in very cold weather, enabling contamination of metal components from moisture.
A quick book inspection can determine the condition of the boot, which can be checked on most vehicles without being raised on a lift.
The first step in the inspection is to ensure the vehicle is on a level surface, the engine is off, the transmission is in park (or reverse for manual transmissions) and the parking brake is applied.
Drive Axle Boots
Most late-model passenger cars and some vans are front-wheel drive, which means the drive axles are on the front wheels. Each axle has two universal joints protected inside rubber or plastic boots.
It is easy to inspect the boots for tears or rips, and indications of lubrication leaking
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