Previously, when calipers wore out, people would just have them repaired and rebuilt. However, people generally don’t do this now because it’s more economical just to replace them.
Brake calipers can accumulate quite a bit of wear and tear over time. When they are functioning with your vehicle, they are in the presence of an enormous amount of heat. The brake pads and rotors generate heat that exposes the calipers to temperatures that can be more than 300 degrees Fahrenheit.
As the calipers are used, they go through so many cycles of heating and cooling. This, in combination with the moisture to which the calipers are often exposed, can lead to corrosion on the interior and exterior of the brake caliper.
This moisture can come from either humidity or precipitation in the air or any moisture that may be absorbed by the brake fluid. The water that gets into the brake fluid will boil and condense with each of the heating and cooling cycles that take place, and this leads to corrosion when it happens repeatedly.
This corrosion will create rough surfaces on the interiors and exteriors of the calipers. This can cause surfaces to be abrasive and cause undue wear and tear on the seals when the pistons are moving. The piston seals start to leak when too much scraping has taken place.
Brake calipers can get to the point where they don’t move at all if the pistons are stuck inside their chambers after too much corrosion has taken place.
