Tuijodaix Rear Brake Assembly Hydraulic Master Cylinder & Caliper — 15mm Axle, Fits 50–125cc Pit/Dirt Bikes

Tuijodaix Rear Brake Assembly is a complete hydraulic master cylinder and caliper kit with replacement disc brake pads designed for 50–125cc Chinese-style dirt and pit bikes.

This ready-to-install rear brake set combines a hydraulic master cylinder, iron/plastic caliper and a pair of replacement brake pads to update or repair SSR, KLX-style and other 50–125cc small-displacement off-road motorcycles. It’s built to fit many popular Chinese tunnel-frame bikes (not for SSR150) and includes the mounting measurements and hose length needed to confirm compatibility before purchase.

Will this brake assembly fit my SSR, KLX or pit bike?

Compatibility is broad across many 50–125cc Chinese-style dirt and pit bikes, but it is not universal. Use the supplied dimensions to verify fit on your swingarm and mounting points.

• Brake hose length: 565mm (22.24").
• Mounting shaft hole: 15mm (0.59").
• Hole diameter: 70mm (2.75").
• Brake cylinder mounting hole distance: 42–56mm (1.65"–2.20").
• Banjo bolt thread: 10mm × 1.25.

How does the construction affect braking performance?

The caliper uses a blend of high-quality iron and reinforced plastic to balance stopping power, corrosion resistance and durability. That construction aims to deliver a firmer brake feel and longer service life than many basic replacement units.

• Iron components provide structural strength for consistent braking force.
• Plastic elements reduce weight and resist corrosion in exposed areas.
• Included brake pads are sized for effective contact: 40mm × 45mm.
• Designed to resist wear for extended maintenance intervals.

What’s included and what do I need to install it?

The package arrives with the hydraulic master cylinder and caliper preassembled and one pair of replacement disc brake pads. Basic tools and standard brake-bleeding supplies are required to mount and commission the unit on your bike.

• 1 × Rear brake assembly (master cylinder + caliper).
• 1 × Pair of replacement disc brake pads (40mm × 45mm).
• Verify your axle diameter is 15mm for proper shaft fitment.
• Bleeding kit, brake fluid, and basic hand tools needed for installation.

How do I confirm this is the right part before buying?

Measure the brake mounting points on your bike and compare them to the kit’s dimensions to avoid incompatibility. Also confirm wheel axle diameter and banjo bolt thread to ensure secure connections and leak-free hydraulic lines.

• Check your bike is within the 50–125cc Chinese-style tunnel-frame family (not SSR150).
• Confirm axle hole is 15mm and caliper hole diameter is about 70mm.
• Ensure banjo bolt thread matches 10mm × 1.25 for the brake hose.
• Compare cylinder mounting hole spacing: 42–56mm range.

Who is this for: This Tuijodaix rear brake assembly is aimed at riders, mechanics and small-shop technicians who maintain or restore Chinese-made 50–125cc dirt bikes, pit bikes and SSR-style models. It suits anyone needing a complete rear hydraulic brake replacement with clear specifications—especially those upgrading worn components or keeping a reliable spare part on hand. If you require certified OEM fitment for a specific model year, verify dimensions and contact a mechanic for fitment help before purchase.