HOPE Tech 4 E4 builds on more than 25 years of experience in the design of hydraulic brake systems. The HOPE Tech 4 brake lever uses a new internal piston seal to reduce friction and the pivot now pivots on roller bearings compared to the Tech 3 version, which has reduced the stiffness of the piston spring. The lower spring stiffness therefore provides a lighter lever action, reducing rider forearm fatigue during long braking sessions. The longer end lever also provides increased power and better modulation of braking. The updated E4 caliper uses hybrid style pistons with a smooth stainless steel outer shell with phenolic liner allowing for smoother movement and less maintenance, while still being able to handle high temperatures without heat transfer during extreme use and descents.