What is a Boot and What is Its Function?

A boot, often referred to as a “rubber cover” at the ends of the steering rack, plays a key role in protecting the power steering system. At first glance, it resembles an accordion and is located on both the left and right sides of the steering rack. Its function is to prevent dirt and water from entering, which could damage the seals and cause oil leakage.

Although the term “boot” in hydraulics refers to a sealing element used to seal pistons and cylinders, in the automotive context, this term has a specific function. The rubber boot is placed at the ends of the steering rack and secured with a clamp and zip ties. As the steering wheel is turned, the boots expand and contract, reducing the risk of rupture.

While the boot is not a direct part of the steering rack, its role in protecting the system is significant. Through proper installation, which includes using the appropriate metal ties (or high-quality plastic ones if metal ones are not available), the boot protects against the ingress of dirt and water, which can lead to corrosion and damage to the seals.

For mechanics, the recommendation is to use additional protection, such as rubber pieces (e.g., an inner bicycle tube) on the rack body before installing the boot. This ensures better sealing, preventing water and dirt from entering.