What tool is used to remove pistons from the calipers during a caliper overhaul?

The removal of pistons from brake calipers during an overhaul is effectively accomplished using compressed air. When compressed air is introduced into the caliper's fluid passage, it forces the piston out of the bore. This method allows for a quick and efficient extraction of the piston without damaging the caliper or the piston itself, making it a preferred choice among technicians.

While hydraulic presses and special caliper tools can be used for various purposes related to brake systems, they are not specifically designed for removing pistons. Brake fluid, on the other hand, is essential for the hydraulic system operation but does not aid in physically removing pistons. Compressed air remains the most straightforward and efficient tool for this task, emphasizing its importance in the brake service process.