M MATI Front Left Brake Master Cylinder for Polaris ATVs — Direct-Fit 2050078 OEM-Spec Replacement

This M MATI brake master cylinder assembly is a direct-fit replacement manufactured to OEM specifications for Polaris ATVs listed with part numbers 2050078, 2050072 and 5131146. Designed as a complete assembly, it arrives boxed and ready to install, built from durable materials with precise machining to deliver consistent hydraulic pressure and extended service life. The unit suits many Polaris models from the mid-1990s through 2001, including Sportsman, Magnum, Xplorer, Xpress, Big Boss, Diesel, Worker and Xpedition series.

Which Polaris models does this master cylinder fit?

This assembly was matched to the factory fitment list used by Polaris and covers a wide range of model years. Confirm compatibility by cross-referencing your vehicle’s model and year with the list below before ordering.

• Sportsman 335 (1999–2000), Sportsman 500 (1996–2001 including RSE and 6X6 variants)
• Magnum 325 & 500 models (2000 and 1999–2000 respectively)
• Xplorer 300/400/500, Xpress 300/400, Xpedition 325/425, Worker 335/500, Big Boss 500 and Diesel 455

How does this replacement match the original Polaris part?

M MATI produces this brake master cylinder as an OEM-specification replica, meaning dimensions, mounting points and hydraulic connections mirror the factory unit. The manufacturing process uses precision tooling to ensure correct sealing surfaces and piston fit for reliable pressure delivery.

• Manufacturer Part #: 2050078; Replacement Part#: 2050072, 5131146
• Machined bores and compatible hydraulic fittings for direct swap-in
• Supplied as a complete assembly—no separate reservoir or fittings required

What should I expect during installation and maintenance?

Installation follows standard brake master cylinder replacement procedures: remove the old unit, transfer any reusable hardware, mount the new assembly, bleed the system and check for leaks. Basic hand tools and knowledge of hydraulic brake bleeding are required; professional installation is recommended if you’re not comfortable working on braking systems.

• Arrives boxed with one brake master cylinder assembly per package
• Requires brake fluid flushing and bleeding after install
• Inspect hoses, fittings and mounting hardware for wear when replacing

What materials and durability features are included?

The assembly is built from corrosion-resistant metals and engineered seals to withstand typical ATV operating conditions. M MATI emphasizes material selection and precision manufacture to deliver a part that holds pressure and resists premature wear under normal use.

• Durable construction to resist contamination and corrosion
• Precision-machined piston bore for consistent hydraulic response
• Designed to meet OEM fit and function expectations

Who this is for: Owners and mechanics who need a dependable front left brake master cylinder replacement for compatible Polaris ATVs—especially those restoring older machines or returning a vehicle to safe, street-legal and trail-ready operation. This product is appropriate for DIYers comfortable with brake system maintenance and for professional shops seeking an OEM-spec alternative to Polaris part #2050078.