The floating caliper is a very simple component with not much sophistication. It has a brake hose mount, a bleeder nipple, and a piston with a cylinder that builds up with pressure as the brakes are applied. This is the main problem that can happen with calipers. The piston has rubber seals, which not only seals the piston, but helps pull the piston back when the brakes are disengaged. So to check that the sealing of the cylinder is okay, measure the bore size of the cylinder, than measure the diameter of the piston.
We start by disassembling the caliper. We give it a good bath so that all measurements and workings are accurate.
Check that all the rubber seals including the piston seals and dust seals are not cracked or worn out. They are rubber, so they may be hardened and not as healthy as they used or need to be.
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