Lever Locks are designed to supplement your standard parking brake by utilizingthe hydraulic service brakes. They are manually operated one-way check valveswhich lock fluid under pressure in the selected brakes. Hand operation leavesthe operator’s feet free for clutch and gas operation. All lever locks includea low pressure warning switch. Supplements a vehicle’s standard parking brake Uses Hydraulic Fluid Manually operated Dash-mounted control for convenient operation Includes low pressure warning switch