ZTTO CNC Tech MTB 4 Piston Hydraulic Disc Brake M840 Left for front / Right for Rear weight : Front about 263g, Rear about 279g , 542g/pair package included Brake + IS to PM 160 Adapter + spare Bh59 Needle + Screws Fit 51 mm IS 74mm post mounting Left lever for front wheel. Right lever for rear wheel. Left lever for front wheel. Right lever for rear wheel. Front brake hose length :800mm Rear brake hose length:1450mm 1. Adjusted the angle of the brake lever, it is now more comfortable to hold. 2. The special model oil needle on the brake side is gone, replaced by the common BH59. So don't worry about the trouble of replacing the hose.and the oil cooler is still there :) Since the above upgrades did not significantly change the appearance, so we did not change the picture yet, thank you for your understanding 4 Metal Pistons Upgrade 4x14mm pistons caliper structure, it's make the brake pads more balanced and create more brake force. The piston is made of aluminum alloy, it's strong and has excellent heat resistance. Cooling Connecter Heat control is very important for stable performance, after using all-aluminum brake and heat sink pads , we even made a cooling fins for the tubing! This is a great invention. these fin will cooling the oil directly! Cable Angle adjustable Caliper hose connecter was rotatable, there is no repression like fixed cable. Pad Contact Point Adjustment An advanced feature, you may have to spend hundreds of dollars to get it in other brands. but we made it in this price :) Required small fingers strength, but big brake force, feel relaxed in the long downhill, Brake performance is not affected by weather changes, still stable, not easy to be affected by soil or rain. ZTTO Cylinder Ratio and Brake Linearity The brake equired strength is small, in the long downhill, fingers and arms are not easy to feel tired.Brake performance is not affected by weather changes, still stable, not easy to be affected by soil or rain. Quickly Install Clamp so you don't need to remove the grips and shifter befroe install the brake. Left lever for front wheel. Right lever for rear wheel. Left front brake hose length :800mm Right rear brake hose length:1450mmdue to there is a part of hose inside the brake , so 30mm is normal.