The brakes are between the belt and chaincase in the driveline. That belt on the 2 clutches allows the engine to freewheel at low RPM for starting and idling. The faster the RPM, the primarly clutch starts to engage and squeeze the sides of the belt to drive the seconary clutch. The primary squeezes harder on the belt with RPM. The two clutches provide unlimited ratios as the belt is squeezed outward by the primary clutch and pulled deeper into the sheaves of the secondary clutch. Nothing like a jet ski drive, more like a golf cart drive but handles much much more HP and allows the sled to go from O to +/-130MPH (on high performance sleds with 120HP and up).