4051027 Caliper Pin Dust Boot equivalent for Renault Trucks

What does a brake caliper pin dust boot do?

A caliper guide pin dust boot acts as a flexible, bellows-shaped sealing element that protects the slide pins of a disc brake caliper from water, mud, road salt, and brake pad dust. On heavy commercial vehicles, floating calipers must travel axially along these pins during every braking application; maintaining smooth movement depends entirely on the pins remaining clean and properly lubricated. This component bridges the gap between the pin and the bore, keeping grease in and external contaminants out.

Compatible vehicles and systems

This component is compatible with Renault Trucks and Volvo vehicles. It is designed as an equivalent to OE standards to ensure precise fitment within the air disc brake system. It is also suitable for vehicles requiring compatibility with WABCO systems.

Installation and maintenance guidance

To ensure optimal braking performance, these boots should be installed by a qualified workshop technician using the correct grease and torque values. It is recommended to inspect the seals at every brake pad change or during routine brake system checks to prevent pin seizure.

System maintenance benefits

Regular maintenance of the caliper guide pins helps prevent uneven pad wear and vibration in the braking system.

OE cross-reference

4051027 (Brake Caliper Pin Dust Boot) is the equivalent of the Renault Trucks, Volvo and WABCO OE numbers. This part directly replaces Renault Trucks OE number 7421748963. It also replaces Volvo OE number 21748964 and WABCO OE number 6403179222.