Hoypeyfiy Rear Hydraulic Disc Brake Kit for 50–125cc ATVs — Rear-Hand Lever, 2-Piston Caliper, 54in Hose

Hoypeyfiy Rear Hand Hydraulic Disc Brake Caliper Assembly is a complete replacement hydraulic rear brake kit with lever, master cylinder, caliper and pads designed for many Chinese-made ATVs, go-karts and dirt bikes from 50cc to 125cc.

If your stock rear brake feels spongy, leaks fluid, or no longer provides confident stopping power, this Hoypeyfiy kit offers a direct-fit hydraulic solution for popular models from TaoTao, Buyang, Coolsport, Kazuma, Sunl and many other China brands. The assembly pairs a rear-hand lever and master cylinder with a two-piston caliper and brake pads, supplied with a 54-inch hose and mounting hardware. Before ordering, verify the listed dimensions and model compatibility to ensure a correct fit.

Which vehicles and engines will this rear brake fit?

This assembly is made for small-displacement recreational vehicles commonly using Chinese aftermarket parts. It fits a wide range of 50cc, 70cc, 90cc, 110cc and 125cc ATVs, go-karts and pit bikes, and is intended as a replacement for many OEMs.

• Compatible with TaoTao, Buyang, Coolsport, Kazuma, Sunl, ROKETA, AIM-EX and similar brands
• Suitable for rear-mounted hydraulic disc brake setups on ATVs and go-karts
• Designed for 50cc–125cc engines commonly used on utility and youth models
• Double-check your vehicle’s mounting geometry and part numbers before purchase

How do the dimensions and hardware affect installation?

Understanding the kit’s physical measurements helps determine whether it will bolt directly in or require minor modifications. The caliper spacing, lever perch size and hose length are typical values for aftermarket Chinese ATVs but should be compared with your existing parts.

• Caliper mounting hole spacing: 2 1/2 inches (center-to-center)
• Brake hose length: 54 inches, routed for rear assemblies
• Brake lever perch diameter: 7/8 inch for handlebar clamp compatibility
• Includes pads, mounting bolts and standard banjo fitting for fluid line

What performance and maintenance should I expect?

The kit delivers hydraulic braking with replaceable pads and a sealed master cylinder. Proper bleeding and periodic pad checks keep the system responsive; do not reuse contaminated fluid or damaged hoses.

• Two new brake pads installed in a two-piston caliper for consistent contact
• Requires brake fluid filling and bleeding after installation (DOT specified by vehicle)
• Inspect hose and banjo fitting torque to prevent leaks
• Pad life depends on riding style, terrain and load—check frequently

Who is this for? This Hoypeyfiy rear hand hydraulic disc brake kit is ideal for owners of small ATVs, youth quads, pit bikes and go-karts who need a cost-effective, direct-fit replacement for a failing rear hydraulic brake. It's suitable for mechanics and hobbyists comfortable with basic brake plumbing and bleeding. If you require a precise OEM match, compare the 2 1/2" caliper spacing, 7/8" lever perch and 54" hose to your current parts before buying. For general replacement across many Chinese-brand vehicles, this assembly provides a practical, ready-to-install option to restore hydraulic stopping power.