Was issued u.s. Patent no. 9, 321, 605 for the anti-squeal improvement known as the silencertm friction pad. Brakes_250.gif brakes that don't squeal 100% success rate at eliminating brake squeal with dfe's patented silencer pads dover flexo electronics pneumatic brakes and disk brakes are an integral part of a high-performance tension control unwind package. All pneumatic brakes feature a limited travel piston that never scratches the disc, ductile iron disc construction, and expanded disc surface for rapid heat dissipation. Our asbestos-free friction pads are available in several coefficients of friction. No tools are required to change the friction pads, making brake maintenance quick and "hassle free". Dfe's dual disc brakes do not squeal. They are covered by the industry's only 'no squeal' warranty. If you've got squealing brakes, or any kind of brake squeal issue, dfe will fix it fast, replace it, or we'll return your money.