Ensure that before you undertake this procedure you buy a brake caliper overhaul kit that applies to your car. For single piston caliper of automobile, begin by partially undoing the caliper and brake pads. Using brake fluid clean the exterior of the brake caliper gently and not to use gasoline kerosene or the like cleaning solvent thereafter place the brake caliper on a clean working bench. Place a piece of wood or a shop rag in the caliper to deaden the shifting of piston, then compress the caliper with the air and ease the piston out to prevent having the piston snapping off. Slide the dust boot out of the caliper bore, and use wooden or plastic material to remove the piston seal from slot. Twist the caliper bleeder valve and then dispose the sleeves, bushings and all rubber components. Dip the rest of the parts in brake fluid and let them sit for a few minutes, and then invert the parts in order to spill out as much brake fluid as possible. Analyse the piston for nicks, burrs or loss of plating and the caliper bore for similar conditions but only providing light surface honing with crocus cloth for mild corrosion. Anyone of the mounting bolts which has sign of corrosion or has been damaged in any way should also be rejected. On assembly it is important to apply clean brake fluid on the piston bores and the seal should then be inserted in the caliper bore groove as depicted below; Wipe off the piston and assemble a boot having the fold toward the open end and with the piston squarely placed in the caliper bore apply pressure to help the piston settle on the bottom. Place the dust boot in the caliper counter bore and Msh with the drift to properly set into place the dust boot under the caliper face and then fit the bleeder value. The installation is carried out in the reverse of the removal process using new copper gaskets at the brake hose connection as well as bleeding of the system. In the case of a dual-piston caliper, the procedure is slightly different, and while it is relatively safe, be careful, as the bulk of the material here is aluminum, and it can easily be scratched. When using compressed air to remove the pistons, if they do not come out at the same time, and remove the boot from the unloaded cylinder and reinsert the piston to seal the cylinder and use the spacer to pry out the other piston. Repeat all the above mentioned procedures for the pistons, and bore checks, and use only fingers to install the piston boots into the caliper bores.
