RZEOZU Mini Bike Hydraulic Rear Brake Kit for Mega Moto MMB80 MMB105 Coleman RB100 — 50" Hose, Direct-Fit Caliper Conversion

This RZEOZU mini bike hydraulic rear brake kit converts your Mega Moto MMB80/MMB105/Coleman RB100 mechanical rear cable brake to a compact hydraulic system for stronger, smoother stopping power.

If your minibike uses an original cable-actuated rear brake and you want improved modulation and confidence on steep trails or heavier loads, this bolt-on hydraulic caliper conversion is engineered specifically for several Mega Moto and Coleman minibike models. The kit includes a rear caliper, bracket sized to fit the factory frame mounting points, brake pads, mounting hardware, and a pre-measured hose so you can install without cutting or welding. It’s a direct replacement designed to match the MMB80, MMB105 and RB100 rear mount geometry—always check dimensions before ordering.

Will this hydraulic kit fit my Mega Moto MMB80 or MMB105 rear brake?

Yes — the bracket and caliper are tailored to the listed minibike models and sit in the same 2" (51 mm) hole spacing used on those frames. The kit is intended as a direct replacement without frame modification.

• Compatible models: Monster Moto Mega Moto MMB80, MMB105, GMB100 and Coleman RB100/RT100 as stated.
• Bracket mounting hole distance: 2" (51 mm) to match factory points.
• Hose length: 50" pre-cut to reach the rear position from a 7/8" (22 mm) handlebar master cylinder.

How much braking improvement should I expect compared to the stock cable brake?

The hydraulic set provides more consistent lever feel and greater stopping force under load, improving responsiveness on descents and rough surfaces. It reduces lever effort and offers finer control when modulating braking force.

• Hydraulic pressure transfers power more efficiently than cable pull.
• Smoother modulation reduces wheel lock-up risk on loose terrain.
• Brake pads included to restore full pad contact area for stronger bite.

Is installation difficult and what tools are required?

Installation is designed to be straightforward: the bracket bolts to existing rear mount points and the hose connects to a compatible 7/8" (22 mm) master cylinder. No welding or frame modifications are required, though basic mechanical skills are helpful.

• Included: rear caliper, bracket, two brake pads, and mounting hardware.
• Recommended tools: metric sockets/ratchet, Allen keys, torque wrench, and hydraulic fluid for bleeding.
• Time estimate: a mechanic or competent DIYer can complete it in under two hours, plus bleeding time.

What should I verify before buying this caliper kit?

Confirm your minibike’s model and measure the rear caliper mounting hole spacing and handlebar master cylinder size. This kit is model-specific and will not fit other unlisted minibikes.

• Check that your rear mount hole spacing is approximately 2" (51 mm).
• Ensure your handlebar master cylinder is 7/8" (22 mm) or compatible with a 50" hose length.
• Compare photos and dimensions to your current rear brake assembly before purchase.

Who is this for: riders of Monster Moto Mega Moto MMB80, MMB105, GMB100 or Coleman RB100/RT100 minibikes who want a direct-fit upgrade from a mechanical cable rear brake to a compact hydraulic caliper for stronger, more consistent braking without welding or frame modification. This kit suits DIY mechanics, minibike enthusiasts, and technicians replacing worn cable systems who need a model-specific, bolt-on hydraulic solution.