Cleaning and lubricating slide pins is a standard procedure when doing a brake job.
This is some of the most underrated advice in regards to disc brake maintenance.
Brake dust is made mostly of iron particles. Iron is reactive to oxygen, creating hydrous iron oxide (rust). Now water is usually categorized as neutrally based, but the world we live in today produces precipitation with a pH of about 5 (acid rain), or for some of you among higher density populations, a pH of 4.
Splashing through acidic rainfall (or salted winter roads) and dusting our brake components with iron particles is the mother load of bad ideas on planet bad idea. But what can we do? We wash our cars, but our brake systems seldom see the care our RAV's body gets. Semi-Metallic and Ceramic brake pads have helped reduce dust over the years, but our RAV4.2s still bear the torture of iron collection and acid treatment over decades.
I placed my brake pins in containers of pure white vinegar for days at a time to completely remove the oxides. If the pins were badly pitted, I would recommend replacing with new. Then I polished the pins to remove surface blemishes and applied silicone grease. Avoid petroleum greases. I use a high temp Permatex product.
Permatex Silicone Ceramic Extreme Brake Parts Lubricant protect and lubricates every part of a brake assembly and prevents comebacks caused by irritating brake noise. -Formulated to reduce brake noise, vibrations and harshness -Dampens natural vibrating frequencies -Treated with the latest...