Diaphragm in master cylinder cap provides completely enclosed system. Raised fill plate prevents intrusion of contaminants when removing cap. Tie loops on cap allow for tethering, creating a tamper-proof seal. Bellow boot on push rod for more resistance to moisture and contaminants. Color-coded decal on emergency lever allows quick glance if brakes are on or off. Actuators fit standard 3" tongues. Acetyl Copolymer liners eliminate reliability issues with rollers. Line pressure controlled by spring loaded push rod. Integrated shock dampening design. Emergency cable is attached with a new clevis for easy replacement in the field. Standard master cylinder (U. S. Patent #6, 658, 844) on all actuator models are made of long glass reinforced nylon. Rust and corrosion are eliminated.