The M4 is a new 4 piston brake system from Clarks. Clarks most powerful production brake produced to date, the M4 is lightweight with a slimline design, and 4 x 16mm pistons per caliper, each delivering smooth, powerful, modulated braking force at the rotors. Perfect for all riding conditions encountered by the adventurous downhill rider and e-bikes, the M4 is the ideal brake system for more challenging environments where feathering is required.   Features 4 Piston hydraulic brake system for MTB and downhill riders. Lightweight design. Self adjusting pistons . 2 x Finger lever. Lever reach adjustment to suit all hand sizes. I.S and Post mount fit. Mineral oil fluid to protect the environment.   Includes M4 Front (1000mm hose) and rear (1700mm hose) disc brakes. 1 x 180mm 6-bolt rotor. 1 x 160mm 6-bolt rotor. Spare olives.