M MATI Rear Brake Master Cylinder for Polaris ATVs — Replacement Assembly with Reservoir & Hose

M MATI Rear Brake Master Cylinder is a complete rear foot-brake master cylinder assembly designed to replace Polaris part numbers 1910301, 1910311, 1910791, 1910790, 1911113 (replacement 1930899) and restore reliable braking on compatible Polaris ATVs.

This assembly ships as a ready-to-install unit with reservoir, over-length hose, banjo bolt and copper crush washer so you can swap the worn or leaking rear master cylinder without modifying brake lines. It’s manufactured to match the OEM mounting and hose connections for a straightforward replacement on a wide range of Polaris Sportsman, Scrambler, Magnum, Trail Blazer, Trail Boss, Xpedition, Xplorer and other model years listed below. The kit aims to save installation time and reduce the need for extra parts during a repair.

Will this master cylinder fit my Polaris ATV?

Check compatibility against your vehicle’s model and year before ordering. This M MATI rear master cylinder covers many common Polaris models from late 1990s through mid-2000s; it’s intended as a direct replacement for specified Polaris part numbers.

• Fits Polaris Diesel 455 (1999–2001) and many Magnum, Scrambler, Sportsman, Trail Blazer, Trail Boss, Worker, Xpedition, and Xplorer models.
• Compatible part numbers: manufacturer 1910301, 1910311, 1910791, 1910790, 1911113; replacement 1930899.
• Not suitable for excluded variants (e.g., certain X2, 6x6, Touring or Tractor editions) — verify against your VIN/model details.

What’s included and why it simplifies installation?

The assembly arrives with all the components required to reconnect to your existing brake hose and mounting points. Including the reservoir, over-length hose, banjo bolt and copper adapter eliminates hunting for small fittings and reduces installation steps.

• Complete rear brake master cylinder assembly with reservoir pre-attached.
• Over-length hose to reach original routing without cutting or splicing.
• Banjo bolt and copper crush washer included to seal the hose connection properly.

How does this part restore brake performance?

Replacing a leaking or internally-failed master cylinder restores hydraulic pressure and pedal feel to the rear brake circuit. A proper-fit replacement helps eliminate spongy brakes, external fluid leaks and inconsistent braking response when the original unit has deteriorated.

• Re-establishes sealed hydraulic pressure for consistent braking feel.
• New reservoir reduces air ingress and simplifies bleeding procedures.
• Crisp OEM-style mounting and hose interface for predictable performance.

How should I maintain or install the replacement unit?

Basic mechanical skills and common hand tools are sufficient for the swap; have brake fluid and a bleed kit ready. Follow safe lifting practices and refer to vehicle service manuals for torque and bleeding sequences to ensure reliable results.

• Drain old fluid, unbolt the old master cylinder, and transfer hose routing to the new unit.
• Use the provided banjo bolt and copper washer; tighten to manufacturer torque specs.
• Bleed the rear brake circuit until fluid runs clear and pedal feel is firm.

Who is this product for? If you own a qualifying Polaris ATV with a failing or leaking rear foot-brake master cylinder and you prefer a direct replacement rather than rebuilding the original, this M MATI assembly is built for you. It suits DIY mechanics, ATV maintenance shops, and owners restoring older Polaris units who need an OEM-style replacement that includes the small fittings and hose required to finish the repair quickly. Always verify fitment against your model/year and consult a qualified technician if you’re unsure about installation or brake system service.