PRO BAT Go Kart Rear Hydraulic Brake Assembly Caliper Master Cylinder

In this review the PRO BAT Go Kart Rear Hydraulic Brake Assembly is evaluated for small ATVs, go karts and golf cart projects where a complete rear brake upgrade is needed. The kit stands out because it bundles a hydraulic caliper, master cylinder, brake pads and a 158mm rotor so buyers get a matched set ready for installation. For riders who want a compact, bolt-on rear disc solution, this kit offers a clear value proposition, though installation details and pad retention are worth checking during fitment.

Key Features

• Complete kit: Includes a rear hydraulic brake assembly, 158mm disc rotor, a pair of brake pads and mounting bolts so users receive everything required for a rear brake swap.
• Compact rotor size: The 158mm outer diameter rotor and 9mm thickness provide a compact braking surface suited to 50cc-250cc small ATVs and go karts without large frame modifications.
• Clear mounting dimensions: Caliper mounting hole center spacing of 63mm and master cylinder hole spacing of 45mm make it easier to verify fitment on common Chinese ATV and go kart frames.
• Long brake line: The 1400mm brake tubing gives generous reach for most rear installations on quads, buggies and drift trikes.
• Hardware included: Four rotor bolts, two caliper bolts and three cable ties are supplied to simplify the installation process and secure routing of the brake line.

Who It's For

This kit is best for hands-on owners of Chinese 50cc to 250cc ATVs, go karts, drift trikes and small buggies who need a rear hydraulic brake solution and prefer a single purchase that includes rotor, pads and the master cylinder. It is also suited for custom builders who can adapt mounting using the provided dimensions.

Those who should look elsewhere include riders seeking high-performance or oversized braking for heavy duty offroad use, and buyers who need brand-specific OEM fitment without any modification; careful measurement is advised before ordering.

Pros & Cons

Pros

• Complete, matched rear brake assembly reduces parts hunting and speeds installation.
• Compact 158mm rotor and 9mm thickness fit small frames and work with 50cc to 250cc machines.
• Included hardware and 1400mm brake hose simplify a clean install and routing.

Cons

• Some customers report mixed functionality and occasional issues with pads seating or coming loose, so verify pad retention during installation.

Specifications

Fitment	50cc - 250cc Chinese ATV, go kart, buggy, drift trike
Rotor outer diameter	158mm / 6.22 in
Rotor inner diameter	48mm / 1.88 in
Rotor thickness	9mm / 0.35 in
Brake tubing length	1400mm / 55.12 in
Caliper mounting spacing	63mm / 2.48 in
Master cylinder hole spacing	45mm / 1.77 in

Our Verdict

The PRO BAT rear hydraulic brake kit is a practical, value-oriented choice for DIYers and small-vehicle owners who want a bundled rear disc solution with clear mounting dimensions and included hardware. It delivers good stopping potential for light machines and is especially useful when a complete replacement is preferred, but installers should confirm pad seating and secure the pads during assembly to avoid the occasional retention issue.

Frequently Asked Questions

Will this kit fit my 110cc go kart?
The kit lists fitment for 50cc to 250cc Chinese ATVs and go karts; check the caliper and master cylinder mounting spacings of 63mm and 45mm against your frame before purchasing.

Are mounting bolts and hoses included?
Yes, the package includes four rotor bolts, two caliper bolts, three ties and a 1400mm brake hose as part of the assembled brake unit.

What should I watch for during installation?
Confirm pad seating and retention in the caliper and torque the rotor bolts to proper spec; customers report mixed experiences with pad fit so double-check placement before riding.