Our Tektro Hydraulic Disc Brakes are the perfect hydraulic set up to get your ebike stopping on a dime. Already assembled and pre-bled with hydraulic mineral oil, these Tektro brakes are ready to install right out of the box. Featuring a 2-piston caliper, these hydraulic disc brakes are a great upgrade over regular mechanical disc brakes. Each one of these Tektro Hydraulic Brake sets will come with 2 sets of brakes. One for the front, and one for the rear, both pre-assembled and pre-bled so they are ready to install.