To retract the piston on an integral style rear caliper, which method is recommended?

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Retracting the piston on an integral rear caliper needs controlled, combined compression and rotation. Many integral calipers use a piston that retracts as you push it back in while turning, so using a C-clamp to press the piston in and a wrench to turn it (or the manufacturer’s special tool) provides the correct movement without harming the piston or seals. This method supports the screw-like retraction some pistons have and ensures even load on the piston surface.

Bringing the piston in with brute force, like hammering with a mallet, risks cracking the piston, damaging the bore, or dislodging seals. Standard pliers can crush or nick the piston and fail to apply even, controlled pressure. Applying heat with a torch can degrade rubber seals, affect the bore, and alter brake fluids, leading to leaks or other failures.