FVRITO Hydraulic Rear Disc Brake Master Cylinder & Caliper Kit — 12mm Axle for SSR 125/110cc, Includes Spare Pads

FVRITO's hydraulic rear disc brake master cylinder and caliper assembly is a complete 12mm rear brake kit designed to replace or upgrade the rear braking system on many 50–150cc pit and dirt bikes, including SSR 125 and 110 models.

This compact hydraulic brake assembly combines a master cylinder and caliper into a ready-to-install unit aimed at small-displacement off-road motorcycles and Chinese-made pit bikes. It arrives with spare pads, ties, and a fuel filter, and is intended for frames and wheel shafts that accept a 12mm axle. Read on for fitment details, measurements, installation considerations, and who benefits most from this kit.

Will this rear brake fit my SSR 125 or 110cc pit bike?

Compatibility depends primarily on axle diameter and mounting spacing. The FVRITO assembly is made for a 12mm rear wheel shaft and suits many 50–150cc models from common Chinese and off-road brands, but it will not fit bikes with a 15mm axle without modification.

• Designed for 12mm rear wheel shafts only—confirm your axle size before buying.
• Works with a long list of brands and models commonly used in pit bikes and small dirt bikes.
• Check mounting hole distance and banjo bolt thread size against your bike.

What are the exact dimensions and connection specs I need to check?

The listing includes several key measurements you should compare with your bike before ordering. Match the brake cylinder mounting range, hose length, and banjo bolt thread to avoid fitment issues during installation.

• Mounting hole distance: adjustable in the 42–50mm (1.65–1.97") range.
• Brake oil hose length: approximately 550mm (21.65").
• Hole diameter (for rotor clearance): about 79mm (3.11").
• Mount axle hole: 12mm (0.47"); banjo bolt: M10 x 1.25.

What comes in the package and what tools or parts might I still need?

• Included: 1 brake assembly, 3 cable/tie straps, 1 extra pair of brake pads, 1 fuel filter.
• Commonly required but not included: DOT brake fluid, basic hand tools, thread sealant or copper crush washer if your banjo fitting differs.
• May require minor bracket or routing adjustments to align with your existing rotor and axle spacing.

How should I confirm fitment and avoid common mistakes?

Carefully compare the product measurements and the images to your bike's existing hardware before ordering. Confirm the axle diameter, mounting distance, and bolt thread size, and consider consulting the seller if any dimension is unclear.

• Measure your rear axle diameter—this product fits 12mm shafts only.
• Compare the listed mounting hole distance (42–50mm) to your caliper bracket points.
• Verify banjo bolt thread (M10x1.25) and hose routing for clearance and length.

Who is this for? This FVRITO rear hydraulic disc brake assembly suits riders, mechanics, and DIYers upgrading or replacing the rear brake system on small off-road bikes and pit motorcycles from 50cc to about 150cc—especially SSR 125/110 owners and riders of similar Chinese-brand models. It's a practical option for those who need a ready-to-install, 12mm-axle-compatible hydraulic brake unit and who can confirm the measurements match their bike. If you are unsure about fitment, measure your axle and mounting points or contact the seller with your bike model and dimensions before purchasing.