Power Brake Conversion Kit1957-1977 Ford F-100 PickupDisc/Drum, Drum/DrumIncludes:7 in. Dia. Single Diaphragm Brake Booster1 in. Bore Master CylinderAdjustable Proportion Valve/Dist. BlockBrackets/Hardware/Lines JEGS 555-631527 Power Brake Conversion Kit Features:Includes power booster rod extensionSingle diaphragm (8 in. Diameter) brake booster Steel master-to-valve lines/fittingsAdjustable proportioning valve/distribution block kitDual reservoir master cylinderApplication-specific booster/valve bracketsBlack Powder-coated brake booster/valve/brackets3/8 in. x 24 SAE I.F.F. proportioning valve fittings5/16 in. proportioning valve mounting holes