For over 25 years PM has produced only the highest quality brake systems for motorcycles. Through strenuous race track development and a continual push for innovative products PM has stayed on top of the industry and continues to supply the best brake systems available. The heart of PM's quality is in the design and function of the brake caliper. Every PM caliper housing is CNC machined from billet aluminum and boast a no flex design. Caliper pistons are precision machined micro finish stainless steel and our piston seals are custom manufactured rubber designed to withstand the daily torture of heat, movement and brake fluid. Racing has exposed a need for differential bore sizes which use a larger trailing piston to compensate for uneven pad wear under high heat applications. PM has introduced this technology to the public in several four and six piston calipers ensuring smooth powerful braking with even pad wear. Performance Machine has several two, four and six piston dual action calipers for a variety of applications in either clear anodized standard finish or a mirror shine polished finish.