Air Chamber Type - T24Thrust @ 6.5 bar Air - 10,064 N Hydraulic CylinderSize - Ø30mmThrust @ 100 barOil - 7,070 NAir & Hydraulic Brake Chambersconvert air pressure into movement ofthe piston/diaphragm which links thetrailer brake leaver to apply the brake;the hydraulic portion allows the use ofhydraulics instead where fitted.