... , installed between drive shaft 2.bear 80% braking energy. electromagnetic retarder:1.applicable for long drive shaft vehicle, to be installed ... from 500Nm to 3500Nm, adaptable for variety of vehicles; Electromagnetic Retarders serve to slow vehicles down, or maintain a steady ... 550*321297241342400RBA2800630*550*321303241562800RBA3300630*550*321338241683300 second brake system--electromagnetic retarder