The all new Tech 4 E4 builds on Hope's 25+ year experience designing and manufacturing hydraulic brake systems. The Tech 4 uses all new internal sealing for reduced friction and the pivot spins on roller bearings allowing the spring rate to be reduced. The lower spring rate in turn gives a lighter lever action reducing rider fatigue and keeping their legendary feel and modulation. The updated E4 caliper utilizes hybrid style stainless steel pistons with a phenolic insert allowing for smoother movement and less maintenance while still being able to manage high temperatures without heat transfer during extreme use.