The Safe, Precise Way to Reset Your MTB 4-pot Pistons or do the Maintenance. absoluteBLACK bicycle Carbon Piston Press Tool is the safest way to reset hydraulic brake pistons when installing new pads (also serves as a bleed block). Unlike screwdrivers or levers that can crack ceramic pistons or damage seals, our tool applies even pressure across both pistons at once—fast, safe, and precise. It pushes evenly across the piston faces, ensuring concentric and parallel retraction into the caliper bore—minimizing seal stress and avoiding the tilt that often occurs with improvised lever methods. Made from carbon-fiber–reinforced polymer with titanium hardware, it’s built for durability and effortless pad changes, ride after ride. At just 13.5 g, it feels perfect on the workbench—and even better in your pack for lightweight bike adventures.
Specs
Mass (+/-1g): 13,5g (size ~6.5 x 3.3cm)
Color Black
Compatibility: All 4-piston hydraulic calipers // Except:: Sram Maven and Magura 4-pot brakes
Materials: carbon-fiber–reinforced polymer, Titanium bolt and rubber o-rings
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Specs
Size
Metric
Imperial
This is a size chart.
Geo
Metric
Imperial
Geometry of this bike.
Reach
Horizontal measurement taken from the middle of the bottom backet to the middle of the headtube.
Stack
Vertical measurement taken from the middle of the bottom bracket to the middle of the headtube.
Effective Top Tube
Horizontal measurement taken from the middle of the seatube to the middle of the headtube.
Actual Top Tube
True length of the top tube taken from the seatube along the toptup to the headtube.
Standover Height
Vertical measurement taken from the ground to the the middle of toptube.
Seat Tube Angle
Angle of the seatube.
Seat Tube Length
Lenght of the seat tube taken from the bottom bracket to the top of the seat tube (the measure is taken alongside the seat tube)
Headtube Angle
Angle of the headtube.
Headtube
Vertical lenght of the headtube.
Chainstay
Horizontal measurement taken from rear axle to the bottom bracket.
Wheelbase
Horizontal measurement between the two wheel axles.
BB Height
Vertical measurement taken from the ground to the bottom bracket (Never taken at sag).
BB Drop
Vertical measurement between the height of the axles and the height of the bottom bracket.