Final answer:
A high-temperature, silicone-based grease is recommended for lubricating caliper guide pins when servicing a caliper bracket, to ensure proper movement and avoid degradation of rubber components.
Step-by-step explanation:
When servicing a caliper bracket, it is essential to use the correct lubricant on the caliper guide pins. These pins allow the caliper to slide back and forth so the brake pads can make contact with the brake rotor evenly. The recommended lubricant is a high-temperature, silicone-based grease that is specifically designed for brake systems. This grease must be resistant to heat and should not deteriorate rubber components. It is crucial to avoid petroleum-based greases as they can cause the rubber boots on the guide pins to swell and degrade, leading to brake malfunctions.