FVRITO 12mm Rear Hydraulic Brake Assembly for 50–150cc Pit Bikes — Master Cylinder, Caliper, 550mm Hose

The FVRITO 12mm rear disc hydraulic brake assembly is a complete replacement master cylinder, caliper and pad kit designed for 50–150cc Chinese pit and dirt bikes with a 12mm rear wheel shaft.

This compact, ready-to-install brake assembly combines a 12mm mounting axle, 550mm brake hose and an integrated master cylinder to restore rear stopping power on many small-displacement bikes. It’s built to match common Chinese-made models (SSR, Taotao, Apollo, Coolster, Roketa, Pitster Pro, Atomik and similar brands) and comes with spare pads and basic fittings so you can install quickly and check fitment before final mounting.

Will this brake assembly fit my pit bike?

Compatibility depends on axle diameter and mounting spacing. This assembly is built for 12mm rear wheel shafts and mounting hole distances between 42–50mm; confirm your bike’s shaft size and bracket spacing before ordering.

• Intended for 12mm axle shaft bikes (not compatible with 15mm shafts).
• Mounting hole distance: 42–50mm (1.65–1.97 inches).
• Banjo bolt thread: M10 x 1.25 for brake hose connection.
• Commonly fits many 50–150cc Chinese pit/dirt bikes and popular model lines.

What components come in the box and what tools will I need?

The kit ships with the brake assembly pre-mounted to the hose plus a few extras so you can swap parts on the trail. Typical installation requires basic hand tools and bleeding supplies to ensure proper hydraulic function after fitting.

• Included: 1x brake assembly (master cylinder + caliper), 3x cable ties, 1x extra brake pad set, 1x fuel filter.
• Tools recommended: metric sockets/wrenches, pliers, hex keys, and a simple brake-bleeding kit.
• Brake hose length: 550mm (approx. 21.65 inches) — trim and refit as needed by a trained mechanic.

How does the FVRITO assembly affect braking performance and maintenance?

Replacing a worn rear master cylinder and caliper restores pedal feel and reduces sponginess from leaks or degraded seals. This hydraulic assembly uses a standard banjo connection and replaceable pads to keep long-term maintenance simple and cost-effective.

• Hole diameter for mounting: 79mm, enabling stable caliper positioning.
• Mount axle hole: 12mm to match 12mm rear shafts without modification.
• Supplied extra pads for quick roadside replacement.
• Regular bleeding and fluid checks recommended for consistent performance.

What sizing and fit checks should I run before ordering?

Double-check a few physical measurements on your bike so the part bolts up cleanly and the hose reaches the master cylinder. If any measurement falls outside the listed range, this assembly may not fit correctly.

• Confirm rear wheel shaft diameter is 12mm (not 15mm).
• Measure caliper mounting hole centers: 42–50mm acceptable.
• Verify banjo bolt thread and brake hose routing are compatible with your frame.
• Compare the kit’s 79mm hole diameter against your bracket clearances.

Who is this for: Riders and mechanics who need an economical, drop-in style rear hydraulic brake replacement for 50–150cc Chinese pit and small dirt bikes. Ideal for owners of SSR, Taotao, Coolster, Roketa, Apollo, Pitster Pro, Atomik and similar models who require a 12mm axle solution and want spare pads and basic hardware included. If you’re unsure about fit, measure your axle and mounting spacing or message the seller with model details for compatibility guidance before purchase.