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Slide pins that let the caliper move freely.
Sticking slide pins can cause uneven pad wear and pulling under braking. Match the pin design and ensure the boots fit tightly. Clean the bores and use the correct high-temp pin grease. Free movement helps the pads retract correctly.
Heat, age and incorrect removal can tear the boot.
A torn boot allows dirt in, which can seize the pin and affect braking.
Yes. Boots match the caliper and pin design.