Ruikarhop Rear Brake Master Cylinder Caliper for 50–125cc ATVs — Iron Body, 500mm Hose, Pre-installed Pads

Ruikarhop rear brake master cylinder caliper designed to replace worn rear disc brake assemblies on 50–125cc Chinese ATVs and quads.

This replacement rear brake caliper and master cylinder assembly provides a direct-fit brake solution for many popular small-displacement Chinese ATVs including TaoTao, Coolster, Peace and dozens of other brands and models. Built from iron and hardened plastic components, the unit restores rear braking performance with corrosion resistance and improved wear life. The package includes the caliper pre-installed with brake pads and a 500mm brake line suitable for most youth and utility quads in the 50–125cc range.

Which ATVs will this rear brake caliper fit?

This assembly is intended for a wide range of Chinese-manufactured ATVs and youth quads, covering common 50cc through 125cc platforms. It lists specific model compatibilities so you can verify fitment against your vehicle’s make and model. Always compare mounting pitch and hose length before ordering to confirm compatibility.

• Compatible with TaoTao models like Boulder B1, 110B and 125D
• Fits Coolster 3050C, 3125R, 3050D, 3125X, R8, 3050HD
• Also suited for brands: Roketa, Yamoto, Sunl, Alpine, MotoTec, JCL, Apollo, KAYO, Vitacci, ICEbear and many more
• Designed for 50cc, 70cc, 90cc, 110cc and 125cc ATV/quad platforms

How durable and reliable is the Ruikarhop brake caliper?

The caliper combines iron castings with engineered plastics to resist wear and corrosive conditions common to off-road use. Materials are chosen to preserve braking feel while extending service life compared with lower-grade components. This design reduces the likelihood of rust and maintains braking power in dirt, mud and wet environments.

• Iron body for structural strength and heat handling
• Plastic-treated components for corrosion resistance
• Pre-installed brake pads for immediate installation
• Longer service life versus untreated aftermarket parts

What are the key measurements and what's included?

Knowing the physical dimensions helps ensure the caliper will install cleanly on your ATV. The brake line is 500 mm (19.7 inches), and the bottom pump installation pitch measures 63 mm (2.5 inches). The shipment contains the caliper assembled with a pair of brake pads so you get a ready-to-fit replacement.

• Brake line length: 500 mm / 19.7 inches
• Bottom pump installation pitch: 63 mm / 2.5 inches
• Package contents: 1 rear disc brake caliper (pads installed) + 1 pair replacement pads
• Works with many small-displacement ATVs and youth quads

How straightforward is installation and what should I check first?

Installation is similar to most rear caliper swaps on small ATVs but may require basic hand tools and bleeding the brake line afterward. Verify the mounting hole pitch and hose routing match your bike, and inspect the brake rotor clearance and pad alignment before final tightening. If you’re unsure, consult a mechanic experienced with Chinese ATV parts.

• Check mounting pitch (63 mm) and hose length (500 mm) first
• Bleed the brake system after installation for optimal feel
• Confirm pad-to-rotor clearance and secure hardware torque
• Use a qualified technician if you lack motorcycle brake experience

Who is this for: This Ruikarhop rear brake master cylinder caliper is aimed at owners of 50–125cc Chinese-made ATVs and youth quads who need a durable, direct-replacement rear braking unit. It suits DIY mechanics replacing worn brakes, small shop technicians servicing TaoTao, Coolster and similar quads, and riders who want corrosion-resistant components that restore stopping performance without complex modifications.