The OTR Fleet Pro RSD Brake Shoe Kit ensures Expertise Built In™, being engineered to provide distinct stopping power through many speed variations, pressures, and temperatures. This semi truck and trailer part not only meets, but also exceeds all FMVSS121 brake standard requirements for 20K pound axles (165 AL Factor). Its first-class drum compatibility significantly reduces any potential maintenance and downtime. This brake shoe kit is among the highest performing premium-grade blocks on the market. Gain excellent fade and recovery characteristics with this replacement brake shoe kit. FleetPride is your First Click in Heavy Duty®.