Park Tool Disc Brake Pad Spreader

Specs

Construction: Stainless steel head, vinyl-dipped handle

Thickness: 1.95mm

Length: 162mm (6.4 inches)

Function: Reset accidentally engaged hydraulic disc brake pads and rotor substitute during bleeding

MPN: PS-1

FAQ

How does the PS-1 reset accidentally closed brake pads?: When you remove a wheel or squeeze the brake lever without a rotor present, the pistons extend and the pads close together. The PS-1's tapered edge is inserted between the pads and pushed inward to push the pistons back into the caliper, creating clearance for the rotor.

Can I use the PS-1 as a rotor substitute during a brake bleed?: Yes. The PS-1 is shaped to mimic a rotor section, allowing you to insert it into the caliper and pump the lever to check fluid movement and lever feel during a bleed without needing the wheel and rotor in place.

How is the PS-1 different from the PP-1.2 Brake Piston Press?: The PS-1 is a flat spreader tool that pushes both pistons back simultaneously from the pad face. The PP-1.2 Brake Piston Press is designed to press individual pistons back into the bore directly, which is useful for uneven piston extension and detailed caliper service.

Best For

Any cyclist or mechanic who services hydraulic disc brakes. Essential after bleeding brakes or removing a wheel to reset pads that have closed in, and useful during brake bleeding as a rotor substitute to avoid repeated wheel installations.