Shimano offers the complete BR-MT201 rear disc brake for mounting on disc mountain bikes. It features a hydraulic braking system that has been tried and tested for many years without fail.The rear caliper has a Postmount attachment, fitted with two sealed pistons and a pair of organic brake pads. The rear brake is a complete disc brake for mounting on disc-equipped mountain bikes. It features a hydraulic braking system that has been tried and tested over many years without fail.MTB disc brakes Hydraulic system Mineral oil Hose length 1700 mm 2 pistons Right-hand brake lever Postmount caliper mounting