FVRITO 12mm Rear Disc Hydraulic Brake Assembly for 50–150cc Pit Bikes — 550mm Hose, Extra Pads

FVRITO's 12mm rear disc hydraulic brake assembly is a drop-in replacement master cylinder, caliper and pad kit designed for many 50–150cc Chinese pit and dirt bikes with a 12mm rear axle.

This compact hydraulic brake unit combines a 12mm mounting axle caliper, 12mm banjo bolt, 550mm brake hose and extra pads to restore rear stopping power on compatible small-displacement bikes. Built for common models from SSR, TaoTao, Coolster, Roketa and others, the kit provides the mounting geometry and hydraulic fittings most riders need when the original rear brake wears out or leaks. Before ordering, confirm your bike uses a 12mm rear axle and compare the listed dimensions to ensure proper fitment.

Will this brake assembly fit my pit bike?

Compatibility depends on axle diameter and mount spacing. This assembly fits bikes that use a 12mm rear wheel shaft and mounting hole spacing between 42–50mm, which matches many 50–150cc Chinese pit bikes and models listed by FVRITO.

• Designed for 12mm rear axle (not compatible with 15mm shafts).
• Mount hole center-to-center: 42–50mm (1.65–1.97 inches).
• Includes M10x1.25 banjo bolt and 550mm brake line for standard routing.

What are the key dimensions and hardware I should check?

Measure three critical items: axle diameter, mounting hole spacing, and hole diameter at the caliper. Matching these ensures the caliper lines up and the brake hose reaches the master cylinder without excessive bends.

• Mounting hole distance: 42–50mm (1.65–1.97").
• Brake hose length: 550mm (21.65").
• Caliper hole diameter: 79mm (3.11"); mount axle hole: 12mm (0.47").

What comes in the package and what should I expect during installation?

The kit arrives with the main brake assembly plus a few installation accessories so you can swap the rear unit without sourcing extra parts. Basic mechanical skills and standard tools are usually sufficient, but double-check your bike's bleed points and torque specs before final use.

• Included: 1 brake assembly, 3 cable ties, 1 extra set of brake pads, 1 fuel filter.
• Banjo bolt spec: M10x1.25; confirm compatible fittings on your hose routing.
• Plan to bench-bleed and road-test at low speed after installation to ensure proper braking.

How durable and serviceable is this replacement unit?

The assembly is made to restore hydraulic function and is serviceable for routine pad changes and brake fluid maintenance. Replacement pads are included so you can swap friction material quickly; hose and banjo fittings follow common small-bike standards.

• Extra brake pads included for first service or rapid replacement.
• Standard banjo and hose sizes allow sourcing of common replacement parts.
• Inspect seals and bleeder screws periodically to prevent leaks and maintain feel.

Who is this for: This FVRITO rear brake assembly is intended for riders, mechanics and hobbyists who own 50–150cc Chinese-style pit or dirt bikes (SSR, TaoTao, Coolster, Roketa, etc.) that use a 12mm rear axle and need a reliable hydraulic replacement. It’s a practical option for restoring rear brake performance on older or damaged stock units, for track spares, or for builders fitting compatible bikes. If you aren’t certain about axle diameter or mounting geometry, measure your bike or message the seller with model and dimensions before purchase.