Ruikarhop Rear Brake Master Cylinder Caliper for 50–125cc ATVs — 500 mm Line, Includes Spare Pads

High-strength rear brake master cylinder caliper by Ruikarhop for 50–125cc Chinese ATVs provides a direct-fit replacement to restore hydraulic braking performance. If your ATV's rear brake feels soft, leaks, or shows excessive wear, this Ruikarhop rear master cylinder caliper assembly is a drop-in replacement designed for many popular Chinese 50cc–125cc quads and youth ATVs. Built from iron and durable plastics, the unit includes a preinstalled rear disc brake pad and a pair of spare replacement pads in the package so you can reinstall and ride with minimal downtime.

Which ATVs is this caliper compatible with?

The Ruikarhop rear brake caliper fits a wide range of Chinese-brand quads and youth ATVs from 50cc up to 125cc. It’s listed as compatible with many common models from TaoTao, Coolster, Kazuma, Apollo, KAYO and others, including specific model lines like Taotao Boulder, Coolster 3050/3125 series and Vitacci Rider series.

• Fits 50cc, 70cc, 90cc, 110cc and 125cc Chinese ATVs and youth quads.
• Named compatible brands include TaoTao, Coolster, Roketa, Kazuma, KAYO, Apollo, Vitacci, ICEbear, MotoTec and many more.
• Recognized models: Taotao Boulder B1/110B/125D, Coolster 3050C/3125R/3050D/3125X, Vitacci Rider/Hawk, Nitro Grizzly/Torino, and similar units.

What are the key specifications I should check before buying?

Verify mounting dimensions and hose length to ensure the caliper aligns with your bike’s brackets and hydraulic line. The Ruikarhop unit specifies a 500 mm (19.7") brake line length and a bottom pump installation pitch of 63 mm (2.5").

• Brake line length: 500 mm (19.7 inches).
• Bottom pump installation pitch: 63 mm (2.5 inches).
• Package includes: 1 rear disc brake pad installed + 1 pair replacement pads.
• Material: iron caliper body with reinforced plastic components for corrosion resistance.

How durable and serviceable is this replacement caliper?

The assembly uses high-quality iron for strength plus engineered plastics to resist corrosion and wear. That combination improves braking feedback and prolongs service life versus thin, low-grade castings.

• Iron construction for stronger clamping force and heat resistance.
• Plastic processing on non-structural parts to reduce corrosion risk.
• Includes extra pads to simplify immediate maintenance after installation.

How easy is installation and what comes in the box?

This caliper is intended as a direct-fit replacement for many Chinese ATV models, so installation is straightforward for anyone with basic mechanical tools and experience bleeding brakes. The kit ships with a preinstalled rear pad and a spare pair, so you can complete the swap and bed the pads before riding.

• Package contents: 1 rear disc brake pad (installed) and 1 pair replacement pads.
• Designed to bolt into existing rear mount points on compatible ATVs.
• Recommended tools: basic hand tools and brake-bleeding kit for final setup.

Who is this for This Ruikarhop rear brake master cylinder caliper is aimed at owners of Chinese-made 50–125cc ATVs and youth quads who need a reliable replacement for a worn or leaking rear brake assembly. It’s a good choice for hobby riders, repair shops, and fleet operators who want a robust, corrosion-resistant caliper that matches common mounting dimensions and includes replacement pads for quick servicing.

FAQ

Q: Will this fit my 110cc Vitacci ATV?

A: Yes — it’s listed compatible with Vitacci 110cc models like Rider and Hawk, but confirm your brake line length and mounting pitch match the listed specs.

Q: Does the kit include brake pads?

A: Yes — one rear pad comes preinstalled and the package includes an additional pair of replacement disc brake pads.