The Rear Drive Disconnect is a specialist product developed by Kotouč Gearboxes for AWD vehicles, that allows the rear wheels to be disconnected from the engine torque. The activation of the unit is made with the hydraulic handbrake.
The Rear Drive Disconnect is found on R5 rally vehicles where there is no center differential. Both the front and the rear axles are "locked" together. When navigating tight turns that require a handbrake, the hydraulic pressure from the handbrake pushes against the springs inside the disconnect unit and disconnecting the rear wheels from the drive allowing them to turn freely. The race car is able to quickly and efficiently get in and out of the corner quickly.
Depending upon the type of gearbox currently installed in the car and the rotation of the driveshaft, the rear differential of the disconnect unit can be flipped so that the rear wheels will turn in the correct direction.
The rear differential is a limited slip version with plates inside and the preload can be adjusted externally!