156PYD hydraulic disc brake (HDB) is 100% made by Wuxing Star Union and with a fast Leadtime. It is adopting forging process and double piston calipers, and designed for ergonomic 2-finger lever and J kit style installation (also support for traditional outside of bike frame installation). It uses high quality electronic switch and fully sealed waterproof and dust proof structure and very suitable for assisting bicycle (hub motor) and pedelec (mid-drive motor). It has a reasonable price and selling as a set that it includes one pair of hydraulic disc brake levers, two calipers, two brake pads, optional adaptor (IS or PM) and 2pcs high quality disc. The default material of brake pad is Kevlar, you can also choose ceramic for better performance. The production capability of this HDB is amazing so we can ensure nice quality and quick lead time. Length: 2 fingers width. Size: Upper Pump L184mm W106mm H48mm Lower Pump L86mm W45.6mm H37.1mm. Weight: Upper pump 166g, lower pump 138g. Waterproof level: IPX6. Material: Caliper/bracket: Cast Aluminum,. Lever: Forge Steel Q235. Wiring: 2 pins Current: 1A(Maximum). Operating Temperature: -20℃-60℃。 Stretching Resistance: ≥450N. Durability: 100000 Mating cycle. Optional: With three way tube also. The disc size includes 140mm, 160mm, 180mm and 203mm. The disc model includes DP3,DP5,DP6 and DP8 etc. The installation way includes pair, three way tube and single,and have PM and IS type.And left brake control front wheel, right brake control the rear wheel or left brake control the rear wheel, right brake control the front wheel. The connection type of oil tube are general type and inside type. The brake pads we have resin, copper and ceramic for your options.Open system,and it uses mineral oil.With two pistons for brake(caliper inside).Lever: forging aluminum.Bracket: Casting aluminum. Caliper: Forging aluminum.Sensor control switch, the maximum current is 1A. It passed ISO4210 brake test, 800Wh Heat Resistant test, and with ROHS certificate.