Park Tool Disc Brake Pad Spreader. A must-have tool for any rider or mechanic who services hydraulic brakes. The PS-1 Pad Spreader features a tapered edge designed to drive apart and reset hydraulic bicycle brake pads that may have been accidentally engaged. The head of the PS-1 mimics a section of disc brake rotor with strong stainless steel construction and a long vinyl-dipped handle for leverage and comfort. The PS-1 can also be used as a temporary stand-in for the rotor when testing or servicing the hydraulic system negating the need to repeatedly remove and install the wheel.