Aynaxcol Rear Left Hydraulic Brake Caliper Assembly for 50–150cc ATVs Mini Bikes — Direct-Fit Replacement, 59" Hose

Aynaxcol left-hand rear hydraulic disc brake caliper assembly replaces worn units on many Chinese 50–150cc ATVs, go-karts, dune buggies and mini bikes for reliable stopping power.

This complete rear hydraulic brake assembly is designed as a direct-fit replacement for many Chinese-made small off-road vehicles from brands such as Taotao, Roketa, Sunl and Baja. Built to match common mounting and hose dimensions used on 50cc through 150cc models, it offers a straightforward swap when the original caliper becomes leaky, seized, or damaged. Before ordering, check your vehicle’s mounting and part number to ensure compatibility.

Will this caliper fit my 50cc, 90cc or 125cc ATV?

Compatibility is broad but not universal — this caliper covers most Chinese 50cc–150cc quads and mini bikes that use a left-hand rear hydraulic brake design and the same mounting pattern. Use the detailed dimensions and the OEM part number reference to confirm fitment.

• Replaces OEM part number: 256878
• Fits many 50cc, 70cc, 90cc, 110cc, 125cc, and 150cc Chinese-made ATVs and mini bikes
• Intended for left-hand rear hydraulic disc brake setups

What are the mounting and hose dimensions I need to check?

Measure your current caliper and hose to verify the new assembly will bolt up and reach the master cylinder. Key measurements are given in both imperial and metric for quick comparison.

• Mounting hole diameter: 7/8 inch (22 mm)
• Distance between mounting holes (center to center): 2.5 inches (63 mm)
• Brake hose length: 59 inches (1500 mm)
• Brake lever length: 7.8 inches (200 mm)

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

The shipment contains the complete rear hydraulic disc brake caliper assembly ready for install; basic mechanical skills and common tools are usually enough for the swap. You may need to bleed the brake line after installation to remove air and achieve firm lever feel.

• Package contents: 1 x Aynaxcol rear hydraulic disc brake caliper assembly
• Expect to bench-bleed or on-vehicle bleed the line after fitting
• Check hose routing and mounting bolts for correct torque and clearance

How durable and maintenance-friendly is this replacement caliper?

The design follows standard hydraulic caliper construction for small off-road vehicles, focusing on ease of replacement and service. Routine inspection and periodic brake fluid replacement will keep the unit functioning; seals and pads are serviceable where standard parts apply.

• Standard hydraulic caliper architecture for easier parts sourcing
• Seals and hose materials suitable for typical off-road exposure
• Recommended to inspect for leaks, pad wear, and proper fluid level regularly

Who is this for: This Aynaxcol rear hydraulic disc brake assembly is intended for owners, mechanics and hobbyists who need a cost-effective, direct-replacement caliper for many Chinese-made small ATVs, go-karts, dune buggies and mini bikes (50–150cc). If your vehicle uses a left-hand rear hydraulic brake and matches the listed dimensions or OEM part number 256878, this assembly provides a practical way to restore braking function. Always verify measurements and compatibility with your machine before purchase.