Tool to Clean Caliper Bracket Bore Holes

The bottom right picture on page 1, I have seen that. That happens when the pins seize.

Why did I know who the OP was just from the title of the post?

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I did a lot of brake jobs on our family cars but I have never had any problem with giide in rust, Lots of problems with caliper bore rust or caliper slide surface, even after they started using stainless steel clips over the brackets. Rust forms under the ss steel clips and binds up the brakes. If you use a car to commute in the winter around here, it is unusual to get more than 2 years out of a brake job.

Fortunately that is one job where most of the cost is labor and markup on parts.

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