When your foot is off the pedal, the springs will push the pressure plate against the clutch disc, which in turn presses against the flywheel.

Steering clutch: multiple-disc oil powder metallurgy disc compressed by spring. hydraulic operated. brake is oil two direction floating band brake operated by mechanical foot pedal.

Conclusions: Incision of the sheath of Schwann of lumbar spinal nerve root could alleviate the symptom of numbness in foot or toe in the patients with lumbar disc protrusion.