Park Tool Disc Brake Pad Spreader
Tools
Park Tool Disc Brake Pad Spreader
Park Tool Disc Brake Pad Spreader
The Park Tool PS-1 Disc Brake Pad Spreader is a must-have tool for any rider or mechanic who services hydraulic disc brakes. Read the overview
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Overview
What does the Park Tool Disc Brake Pad Spreader do?
The Park Tool PS-1 Disc Brake Pad Spreader is a must-have tool for any rider or mechanic who services hydraulic disc brakes. The tapered edge is designed to drive apart and reset hydraulic brake pads that have been accidentally engaged without a rotor present, a common issue after bleeding brakes or removing a wheel. The head of the PS-1 mimics a section of a disc brake rotor in shape and thickness, 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 bleeding a hydraulic brake system, which means you can pump the lever and check for proper fluid movement without needing to install and remove the wheel repeatedly. It is a small, inexpensive tool that prevents the larger expense of a contaminated brake pad or a damaged caliper from a forced pad reset with the wrong tool.
All the 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
Good questions
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Visit the Park Tool page →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.
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