Install the piston in the brake caliper

Fig 1: Identifying Application Of Thin Layer Of New Brake Fluid To Cylinders, Piston And New Sealing Ring

Courtesy of VOLVO CARS OF NORTH AMERICA.

Blow the ducts clean using compressed air.

Apply a thin layer of new brake fluid to the cylinders, the piston and the new sealing ring.

Install: 

• the piston in the caliper. Carefully press the piston to the bottom
• the dust boot in the groove on the piston. Check that everything is positioned correctly
• the rubber sleeves in the caliper for the locating pins.