Air Powered Brake Caliper Wind Back Tool Kit Pneumatic brake caliper piston compressor kit constructed of light weight durable anodized aluminum. . Right or left hand wind-back operation for rear brake caliper pistons.. Pneumatic single piston press shaft operation allows one technician to perform the brake job.. Durable non-impact single piston shaft. Magnetic base to secure press adapters. 15 piece press adapter set. Left or right wind-back operation. O-ring protected shaft to maintain proper pressure. Center shaft constructed of chrome alloy steel. Protective rubber guard to prevent damage to shaft and caliper. 3/8” drive adapter surface 43050