2009 Chevrolet Silverado 3500 HD Brake Caliper

You should remove the brake caliper, drain all the brake fluid from the caliper, secure the brake caliper in a suitable holding device, insert a piece of wood in the brake caliper between the pistons and the outer bridge, cover the brake caliper with a shop towel, apply filtered, non-lubricated compressed air into the brake hose inlet fitting port of the brake caliper, remove the pistons, remove the boots, remove the piston seals, remove the bleeder valve cap, remove the bleeder valve, clean the bleeder valve, the caliper bores, the caliper passages and the pistons with denatured alcohol, clean the brake caliper assembly with denatured alcohol and then dry with filtered, non-lubricated compressed air.

You should not use any air tools to remove or install the brake caliper guide pin bolts, install an open-end wrench to hold the caliper guide pin in line with the brake caliper while removing or installing the caliper guide pin bolts and then ensure the brake caliper guide pin seal is fully seated in the groove of the brake caliper guide pin and the guide pin slides freely in caliper bracket bore.

You should remove the brake caliper, drain all the brake fluid from the caliper, secure the brake caliper in a suitable holding device, insert a piece of wood in the brake caliper between the pistons and the outer bridge, cover the brake caliper with a shop towel, remove the pistons, remove the boots, remove the piston seals, remove the bleeder valve cap, remove the bleeder valve, clean the bleeder valve, the caliper bores, the caliper passages and the pistons with denatured alcohol and then replace the pistons or the caliper.