Floating calipers are mounted in place by guide pins and bushings FIGURE 32-16. The pins allow the caliper to move in and out as the brakes are operated and as the brake pads wear. Since the calipers move on the pins, the bushings must be lubricated with high-temperature, waterproof disc brake caliper grease when they are serviced.
This will help prevent them from binding or sticking. Inspecting, cleaning, and lubricating the pins and pin bores, including any bushings and dust boots, are important steps in disc brake repair.
Floating caliper guide pins.
Sliding caliper.
Sliding calipers have matching machined surfaces on the caliper and caliper mount that allow the caliper to slide in the mount FIGURE 32-17. The sliding mount holds the caliper in position and prevents it from rotating when the brakes are applied. The machined mounts allow the caliper to move side to side as necessary to operate the brakes or adjust for brake pad wear. The surfaces must be cleaned and lubricated with the same high-temperature, waterproof grease as the floating calipers when the calipers are serviced. Sliding calipers are held in place by a spring steel clip or shim that is bolted to the caliper mount.
