Master Cylinder: Assembly

Apply a coat of grease to the contact surfaces of the push rod and piston before installation.
Grease:

SILICONE GREASE G-40M or equivalent

Fig 1: Applying Grease Coating To Push Rod And Piston Contact Surfaces
Courtesy of SUBARU OF AMERICA, INC.
Assemble in the reverse order of disassembly.
Tightening torque:

10 N.m (1.0 kgf-m, 7.4 ft-lb)